CN114799573B - Die cutting device and method for lithium battery pole piece - Google Patents
Die cutting device and method for lithium battery pole piece Download PDFInfo
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- CN114799573B CN114799573B CN202210754772.9A CN202210754772A CN114799573B CN 114799573 B CN114799573 B CN 114799573B CN 202210754772 A CN202210754772 A CN 202210754772A CN 114799573 B CN114799573 B CN 114799573B
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- 238000005520 cutting process Methods 0.000 title claims abstract description 163
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000007547 defect Effects 0.000 claims abstract description 94
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims 1
- 229910001416 lithium ion Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 239000000463 material Substances 0.000 abstract description 11
- 239000002699 waste material Substances 0.000 abstract description 7
- 230000002950 deficient Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/03—Observing, e.g. monitoring, the workpiece
- B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to an automatic reset reclosing system and method based on lithium battery online defect detection. The automatic resetting and re-cutting system based on the online defect detection of the lithium battery comprises a pole piece transmission line, a laser die-cutting unit, an image acquisition unit and a control unit, wherein the control unit identifies a defect point and a mark hole on an image acquired by the image acquisition unit, judges that the distance from the defect point to the next die-cutting mark hole is greater than the distance from the defect point to the re-cut mark hole, controls the laser die-cutting unit to execute re-cutting, and otherwise, performs die-cutting according to the original fixed distance. The automatic resetting and recutting system and method based on the online defect detection of the lithium battery have the advantages of avoiding waste of lithium battery pole piece materials, improving production efficiency and reducing production cost.
Description
Technical Field
The invention relates to lithium battery production equipment, in particular to a device and a method for die cutting of a lithium battery pole piece.
Background
The life of people is closely related to that of lithium batteries. The problem of environmental pollution is increasingly serious along with the improvement of the quality of life of people along with the advancement of science and technology. Therefore, the energy-saving, environment-friendly and green trip is required. Thus promoting the rapid development of the lithium battery industry! The manufacturing process of the lithium battery has extremely high precision requirements, wherein the laser die cutting and slitting process has the characteristics of high efficiency, precision, flexibility, reliability, stability, low loss of welding materials, automation, high safety degree and the like, and is widely applied to the manufacturing process of the lithium battery. In the current laser die cutting process, if a defective product is detected, the current die cutting with the fixed length can be continuously completed, and then the marking is finished to the cutting process.
In the production process of the lithium battery, one battery cell is a pole piece with a fixed length, and two mark holes are usually used for marking one battery cell. The mark holes are used for die cutting in the preparation process of the battery core, subsequent winding equipment is used for identifying the initial position and the end position of the battery core, and the material between the two mark holes is the battery core. As shown in fig. 1, the defect detection unit 180 may detect whether a battery cell has a defect, and after detecting a defect point 200, the conventional technology may continue to work until a complete pole piece finishes die cutting a mark hole 100, so that good-quality materials between the position of the defect point 200 and the next mark hole 100 are divided into whole bad-quality pole pieces, which may cause waste of lithium battery pole piece materials, and have a defect that productivity and production time are seriously affected, and resource and cost are wasted.
Disclosure of Invention
Based on the above, the invention aims to provide a die cutting device and method for a lithium battery pole piece, which can judge whether to re-cut the pole piece in time when the pole piece has defects, and has the advantages of avoiding waste of lithium battery pole piece materials, improving production efficiency and reducing production cost.
The invention is realized by the following scheme:
in a first aspect, the present invention provides a die cutting device for lithium battery electrode sheets, including:
the device comprises a pole piece transmission line, a laser die cutting unit, an image acquisition unit and a control unit, wherein the pole piece transmission line is used for transmitting a pole piece, the laser die cutting unit and the image acquisition unit are respectively arranged at the upstream and the downstream of the pole piece transmission line, the distance D is formed between the die cutting position of the laser die cutting unit and the detection position of the image acquisition unit, and the control unit is respectively in signal connection with the laser die cutting unit and the image acquisition unit;
the laser die cutting unit is used for receiving the signal of the control unit and then die-cutting mark holes at intervals of L1 on the pole piece;
the image acquisition unit is used for continuously and non-repeatedly acquiring a target image of the pole piece and sending the target image to the control unit;
the control unit is used for identifying a defect point and a mark hole in the target image and judging whether the mark hole exists in the target image, if so, acquiring a first position of the mark hole in the length direction of the pole piece according to the position of the mark hole in the image and the number of historical shooting images; identifying a target image behind the mark hole, and if a defect point is detected in the target image after the mark hole and before the next mark hole is detected, acquiring a second position of the defect point in the length direction of the pole piece by the control unit according to the position of the defect point in the image and the number of the historical shot images; the control unit is further used for acquiring a distance L2 between the defect point and a mark hole of next die cutting according to the die cutting length L1, the first position and the second position of the laser die cutting unit;
and if the distance L2 is greater than the distance D, the control unit controls the laser die cutting unit to execute re-cutting.
According to the die cutting device for the lithium battery pole pieces, the pole pieces are detected in the transmission process, and after defects are found, a re-cutting instruction is sent out immediately under the condition that the material can be saved through analysis, so that a large amount of lithium battery pole piece materials can be saved, and the production cost is reduced.
Further, if the distance L2 is smaller than the distance D, the control unit controls the laser die cutting unit to die cut mark holes per interval length L1.
Further, the calculation method of the first position is to take a first row of pixels of a first photo of the pole piece, which is taken by the image acquisition unit, as an absolute starting point, calculate the number of the photos taken before the first position by the number of pixel rows included in each photo, and add the number of the pixel rows of the photo where the first position is located, where the row direction is the length direction of the pole piece;
the calculation method of the second position is to take the first line of pixels of the first picture of the pole piece shot by the image acquisition unit as an absolute starting point, calculate the number of the pictures shot before the second position by the number of pixel lines contained in each picture, and add the number of the pixel lines of the picture at the second position.
Further, the distance L2 is calculated by subtracting the first position from the second position to obtain a distance L3 from the defect point to a mark hole, and then subtracting L3 from the die cutting length L1 to obtain a distance L2.
In a second aspect, the invention provides a light source brightness adaptive control method for lithium battery pole piece coating detection, which comprises the following steps:
s1) controlling a laser die cutting unit to die cut mark holes in the pole piece at intervals of length L1; acquiring a target image from an image acquisition unit, wherein the target image is obtained by continuously and repeatedly acquiring a pole piece image by the image acquisition unit, the image acquisition unit is arranged at the downstream of a pole piece transmission line, a laser die cutting unit is also arranged at the upstream of the pole piece transmission line, and the distance D is between the die cutting position of the laser die cutting unit and the detection position of the image acquisition unit;
s2) identifying a defect point and a mark hole in the target image, judging whether the mark hole exists in the target image, and if so, acquiring a first position of the mark hole in the length direction of the pole piece according to the position of the mark hole in the image and the number of historical shot images;
s3) identifying a target image behind the mark hole, and if a defect point is detected in the target image after the mark hole and before the next mark hole is detected, acquiring a second position of the defect point in the length direction of the pole piece according to the position of the defect point in the image and the number of historical shot images;
s4) acquiring a distance L2 between the defect point and a mark hole of the next die cutting according to the die cutting length L1, the first position and the second position of the laser die cutting unit;
s5) if the distance L2 is larger than the distance D, controlling the laser die cutting unit to execute re-cutting.
Further, if the distance L2 is smaller than the distance D, the method further includes the following steps:
and controlling the laser die cutting unit to die cut mark holes at every interval length L1.
Further, if the pole piece defect is not detected in step S3, the step S1 is repeated.
Further, acquiring a first position of the mark hole in the length direction of the pole piece according to the position of the mark hole in the image and the number of the historical photographed images, and including:
and taking a first row of pixels of a first picture of the pole piece shot by the image acquisition unit as an absolute starting point, calculating the number of the pictures shot before the first position multiplied by the number of pixel rows contained in each picture, and adding the number of the pixel rows of the picture at the first position, wherein the row direction is the length direction of the pole piece.
Further, acquiring a second position of the defect point in the length direction of the pole piece according to the position of the defect point in the image and the number of the historical photographed images, comprising:
and taking the first row of pixels of the first picture of the pole piece shot by the image acquisition unit as an absolute starting point, calculating the number of the pictures shot before the second position multiplied by the number of pixel rows contained in each picture, and adding the number of the pixel rows of the picture at the second position.
Further, acquiring a distance L2 between the defect point and a mark hole of a next die cutting according to the die cutting length L1, the first position and the second position of the laser die cutting unit, including:
and subtracting the first position from the second position to obtain a distance L3 from the defect point to a mark hole, and subtracting L3 from the die cutting length L1 to obtain a distance L2.
According to the die cutting device and method for the lithium battery pole piece, under the mode that the mark holes are die-cut at intervals of the original fixed length L1, images of the defect points and the mark holes are shot by adding the image acquisition unit, and the absolute positions of the mark holes and the defect points are calculated according to the positions of the defect points and the mark holes in the images and the number of the historical shot images: a first position and a second position. And subtracting the first position from the second position to obtain the length L3 of the defect from the previous mark hole, and subtracting L3 from the fixed length L1 to obtain the distance L2 from the defect point to the next fixed die-cutting mark hole. And judging whether to perform re-cutting according to the L2 and the fixed distance D from the die cutting position to the detection position. Specifically, if the distance from a defect point to the next die-cutting mark hole is larger than the distance from the defect point to the re-cut mark hole (namely L2 is larger than D), the control unit sends out a re-cutting signal, and if the distance from the defect point to the next die-cutting mark hole is smaller than the distance from the defect point to the re-cut mark hole (namely L2 is smaller than D), the control unit executes the original fixed-distance die-cutting mark hole instruction. Whether the pole pieces are cut again or not is judged in time, so that the waste of the pole pieces can be greatly saved, and the pole piece cutting machine has the advantages of avoiding waste of lithium battery pole piece materials, improving production efficiency and reducing production cost.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a drawing of a die cutting device for pole pieces in the background art of the present invention;
FIG. 2 is a schematic diagram of a lithium battery pole piece die cutting device during re-cutting in the embodiment of the invention;
fig. 3 is a schematic diagram of a lithium battery pole piece die cutting device in an embodiment of the invention during die cutting.
Reference numerals: mark hole 100, pole piece transmission line 110, pole piece 120, laser die cutting unit 130, image acquisition unit 140, control unit 150, marking unit 160, cutting unit 170, defect detection unit 180, defect point 200, and mark hole 300 is cut again.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Aiming at the technical problems in the background art, the invention provides a die cutting device for a lithium battery pole piece, which comprises a pole piece transmission line 110, a laser die cutting unit 130, an image acquisition unit 140 and a control unit 150, as shown in fig. 2 and 3. The pole piece transmission line 110 is used for transmitting the pole piece 120, the laser die cutting unit 130 and the image acquisition unit 140 are respectively arranged at the upstream and the downstream of the pole piece transmission line 110, and the distance D is kept between the die cutting position of the laser die cutting unit 130 and the detection position of the image acquisition unit 140. The laser die cutting unit 130 and the image acquisition unit 140 are respectively in signal connection with the control unit 150. The control unit 150 may be a computer device, or an electronic device having an arithmetic function, such as a control chip or a server.
The laser die cutting unit 130 is used for receiving a signal of the control unit 150 and then die-cutting the mark hole 100 on the pole piece 120. Specifically, under normal conditions, the control unit 150 needs to control the laser die-cutting unit 130 to die-cut one mark hole 100 every other cell fixed length L1.
The image acquisition unit 140 is configured to continuously and repeatedly acquire a target image of the pole piece 120 and send the acquired target image to the control unit 150. Specifically, the continuous and non-repeated collection means that all the pole pieces 120 passing through the image collection unit 140 are continuously collected and the collected pole pieces 120 have no repeated pixel points. Specifically, the width, height, and acquisition interval of the acquired image need to be determined according to the speed of movement. In a preferred embodiment, the image capturing unit 140 is configured as a CCD camera for capturing the target image.
The control unit 150 is used to identify defective dots 200 and mark holes 100 in the target image. Specifically, in a preferred embodiment, the control unit 150 automatically identifies the mark hole 100 and the defect point 200 on the pole piece 120 by performing an AI software algorithm on the target image. If the control unit 150 recognizes that the mark hole 100 exists in the target image, acquiring a first position of the mark hole 100 in the length direction of the pole piece 120 according to the position of the mark hole 100 in the image and the number of the historical shooting images; then, recognizing the target image after the first position, if a defect point 200 is detected in the target image after the first position and before the next mark hole is detected, the control unit 150 acquiring a second position of the defect point 200 in the length direction of the pole piece 120 according to the position of the defect point 200 in the image and the number of the history shot images; and calculating to obtain a distance L2 between the defect point 200 and the next die-cutting mark hole according to the fixed length L1, the first position and the second position of one battery cell.
As shown in fig. 2, if the distance L2 is greater than the distance D, the control unit 150 controls the laser die-cutting unit 130 to perform the re-cutting of the mark hole 300, and at this time, the laser die-cutting unit 130 will re-cut the mark hole 300 at a distance D from the defect point. Note that D at this time is the distance between the die cutting position of the laser die cutting unit 130 and the detection position of the image capturing unit 140, and is also the distance from the defect point 200 to the re-cut mark hole 300.
As shown in fig. 3, if the distance L2 is less than the distance D, and the control unit 150 has already controlled the laser die-cutting unit 130 to complete die-cutting the mark hole 100 per interval length L1, the control unit 150 does not need to control the laser die-cutting unit 130 to perform the re-cutting action.
In a preferred embodiment, the first position is calculated by taking the first row of pixels of the first picture of the pole piece 120 taken by the image acquisition unit 140 as an absolute starting point, calculating the number of the pictures taken before the first position by the number of pixel rows included in each picture, and adding the number of pixel rows of the picture at the first position, wherein the row direction is the length direction of the pole piece 120. Summarized as the formula: the first position = ((number of pictures-1) × number of picture lines + mark hole Y coordinate) × K value (pixel scale value). The absolute position of the first position can be conveniently obtained by performing statistical calculation on the number of pixel lines of the taken picture of the first position and the number of the historically taken pictures.
In a preferred embodiment, the second position is calculated by taking the first row of pixels of the first picture of the pole piece 120 taken by the image acquisition unit 140 as an absolute starting point, and calculating the number of the pictures taken before the second position by the number of the pixel rows included in each picture, plus the number of the pixel rows of the picture at the second position. Summarized as the formula: the second position = ((number of pictures-1) × number of picture lines + center Y coordinate of defect point) × K value (pixel scale value). The absolute position of the second position can be conveniently obtained by performing statistical calculation on the number of pixel lines of the taken picture of the second position and the number of the historically taken pictures.
In a preferred embodiment, the distance L2 between the defective spot 200 and the next die-cut mark hole is calculated by subtracting the first position from the second position to obtain the distance L3 between the defective spot 200 and the previous mark hole 100, and subtracting L3 from the die-cut length L1 to obtain the distance L2. The distance L2 between the defect point 200 and the next die-cut mark hole can be calculated through the first position, the second position and the fixed die-cut length L1.
In this embodiment, when the image capturing unit 140 captures the target image, since the captured image is a range of the pole piece 120, if there is a defect point 200 in the range and the calculation is in accordance with the re-cutting, there is a probability that an error occurs between the re-cutting mark hole 300 and the defect point 200, and the error is not completely equal to the distance D between the die-cutting position of the laser die-cutting unit 130 and the detection position of the image capturing unit 140. Since the midpoint position of the target image captured by the image capturing unit 140 is D away from the die cutting position of the laser die cutting unit 130, an error occurs if the defective dot 200 occurs before the midpoint position of the target image. In a preferred embodiment, the resulting error can be reduced by reducing the length of the acquired target image.
The embodiment of the application also provides a die cutting method for the lithium battery pole piece, and the control unit 150 applied to the embodiment comprises the following method steps:
s1) die cutting unit die cuts mark holes 100 on the pole piece 120 at intervals of length L1; acquiring a target image from the image acquisition unit 140, wherein the target image is obtained by continuously and repeatedly acquiring images of the pole piece 120 by the image acquisition unit 140, the image acquisition unit 140 is arranged at the downstream of the pole piece transmission line 110, the upstream of the pole piece transmission line 110 is also provided with a laser die-cutting unit 130, and the distance D is between the die-cutting position of the laser die-cutting unit 130 and the detection position of the image acquisition unit 140;
s2) identifying a defect point 200 and a mark hole 100 in a target image, judging whether the mark hole 100 exists in the target image, and if so, acquiring a first position of the mark hole 100 in the length direction of the pole piece 120 according to the position of the mark hole 100 in the image and the number of historical shot images;
s3) identifying the target image behind the mark hole 100, and if a defect point 200 is detected in the target image after the mark hole 100 and before the next mark hole is detected, acquiring a second position of the defect point 200 in the length direction of the pole piece 120 according to the position of the defect point 200 in the image and the number of the historical shot images;
s4) acquiring a distance L2 between the defect point 200 and a mark hole of the next die cutting according to the die cutting length L1, the first position and the second position of the laser die cutting unit 130;
and S5) if the distance L2 is greater than the distance D, controlling the laser die cutting unit 130 to perform re-cutting.
In this embodiment, if the distance L2 in step 5 is less than the distance D, the following steps are further included: and controlling the laser die-cutting unit 130 to die-cut the mark hole 100 every interval length L1. If L2 is less than distance D, no re-cutting need be performed, so the mark holes are die-cut at a fixed die-cut distance L1.
In this embodiment, if the defect of the pole piece 120 is not detected in the die-cut pole piece 120 of the segment in step S3, the execution of step S1 is repeated. If no defective spot 200 is detected, the mark hole is die cut by a fixed die cutting distance L1.
In a preferred embodiment, in step 2, acquiring a first position of the mark hole 100 in the length direction of the pole piece 120 according to the position of the mark hole 100 in the image thereof and the number of the historical captured images includes: taking the first row of pixels of the first photo of the pole piece 120 taken by the image acquisition unit 140 as an absolute starting point, calculating the number of the photos taken before the first position multiplied by the number of pixel rows contained in each photo, and adding the number of the pixel rows of the photo where the first position is located, wherein the row direction is the length direction of the pole piece 120. Summarized as the formula: the first position = ((number of pictures-1) × number of picture lines + mark hole Y coordinate) × K value (pixel scale value). The absolute position of the first position can be conveniently obtained by performing statistical calculation on the number of pixel lines of the taken picture of the first position and the number of the history taken images.
In a preferred embodiment, in step 3, acquiring a second position of the defect point 200 in the length direction of the pole piece 120 according to the position of the defect point 200 in the image thereof and the number of the history captured images includes: taking the first row of pixels of the first picture of the pole piece 120 taken by the image acquisition unit 140 as an absolute starting point, calculating the number of the pictures taken before the second position multiplied by the number of the pixel rows contained in each picture, and adding the number of the pixel rows of the picture at the second position. Summarized as the formula: the second position = ((number of pictures-1) × number of picture lines + center Y coordinate of defect point) × K value (pixel scale value). The absolute position of the second position can be conveniently obtained by performing statistical calculation on the number of pixel lines of the taken picture of the second position and the number of the historically taken pictures.
In a preferred embodiment, in step 4, acquiring a distance L2 between the defect point 200 and a mark hole of a next die-cut according to the die-cut length L1, the first position and the second position of the laser die-cutting unit 130 includes: the distance L3 from the defect point 200 to a mark hole 100 is obtained by subtracting the first position from the second position, and the distance L2 is obtained by subtracting L3 from the die cutting length L1. The distance L2 between the defect point 200 and the next die-cutting mark hole can be calculated through the first position, the second position and the fixed die-cutting length L1.
The working process and the calculation principle of the apparatus and method according to the embodiments of the present application will be described below with reference to a specific application scenario:
the pole piece 120 is transmitted towards one direction on the pole piece transmission line 110, the laser die cutting unit 130 and the image acquisition unit 140 are arranged on the pole piece transmission line 110, and the laser die cutting unit 130 and the image acquisition unit 140 are at a fixed distance D. The control unit 150 controls the laser die-cutting unit 130 to die-cut a mark hole 100 on the pole piece 120 at an interval of a fixed length L1, then the image acquisition unit 140 sends a continuously unrepeated acquired image of the passed pole piece 120 to the control unit 150, the control unit 150 identifies the mark hole 100 and a defect point 200 on the acquired image, calculates the absolute positions of the mark hole 100 and the defect point 200, calculates a distance L2 between the defect point 200 and the mark hole of the next die-cutting distance, compares the sizes of L2 and D, and if L2 is larger than D, the control unit 150 controls the laser die-cutting unit 130 to re-cut the mark hole 300; if L2 is smaller than D, a space fixed length L1 die cut mark hole 100 is performed. The process is repeated continuously after either re-cutting mark hole 300 or die cutting mark hole 100. Taking an example that the fixed length L1 of one battery cell is 16 meters, the distance D between the laser die cutting unit 130 and the image acquisition unit 140 is 3 meters, defects are found after die cutting of the mark hole 100, then re-cutting is carried out immediately, and materials can be saved by 13 meters at most.
In an illustrative example, a die cutting device and method for lithium battery pole pieces further include:
the marking unit 160 is arranged on the pole piece transmission line 110, the marking unit 160 is arranged at the downstream of the image acquisition unit, and the marking unit 160 is in signal connection with the control unit 150 and is used for marking the corresponding defect mark on the pole piece 120 with the defect so as to remove the pole piece 120 in the subsequent process.
In an exemplary example, a die cutting device and method for a lithium battery pole piece further include:
and the cutting unit 170 is arranged at the most downstream of the device, and is used for cutting the pole piece 120 into a plurality of pole pieces from the middle for subsequent processes. It should be noted that the laser die cutting unit 130 needs to die cut the mark hole 100 on each segment to ensure that the cut pole piece has the mark hole.
The die cutting device and the die cutting method for the lithium battery pole piece have the following beneficial effects:
under the mode of die cutting mark hole of every interval fixed length L1 originally, shoot the image in defect point and mark hole through increasing the image acquisition unit, calculate the absolute position of mark hole and defect point according to defect point and mark hole in the position of image and historical shooting image number: a first position and a second position. And subtracting the first position from the second position to obtain the length L3 of the defect from the previous mark hole, and subtracting L3 from the fixed length L1 to obtain the distance L2 of the defect point from the next fixed die-cut mark hole. And judging whether to perform re-cutting according to the L2 and the fixed distance D from the die cutting position to the detection position. Specifically, if the distance from the defect point to the next die-cut mark hole is greater than the distance from the defect point to the re-cut mark hole (namely L2 is greater than D), the control unit sends out a re-cutting signal, and if the distance from the defect point to the next die-cut mark hole is smaller than the distance from the defect point to the re-cut mark hole (namely L2 is less than D), the control unit executes the original instruction of the fixed-distance die-cut mark hole. Whether to recut or not is judged in time, the waste of pole pieces can be saved to a great extent, and the pole piece recut device has the advantages of avoiding waste of materials, improving production efficiency and reducing production cost.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, to those skilled in the art, changes and modifications may be made without departing from the spirit of the present invention, and it is intended that the present invention encompass such changes and modifications.
Claims (10)
1. The utility model provides a lithium-ion battery pole piece's cutting device which characterized in that:
the pole piece transmission line is used for transmitting pole pieces, the laser die cutting unit and the image acquisition unit are respectively arranged at the upstream and the downstream of the pole piece transmission line, the distance D is reserved between the die cutting position of the laser die cutting unit and the detection position of the image acquisition unit, and the control unit is respectively in signal connection with the laser die cutting unit and the image acquisition unit;
the laser die cutting unit is used for receiving the signal of the control unit and then die-cutting mark holes at intervals of L1 on the pole piece;
the image acquisition unit is used for continuously and repeatedly acquiring a target image of the pole piece and sending the target image to the control unit;
the control unit is used for identifying a defect point and a mark hole in the target image and judging whether the mark hole exists in the target image, if so, acquiring a first position of the mark hole in the length direction of the pole piece according to the position of the mark hole in the image and the number of historical shooting images; identifying a target image behind the mark hole, and if a defect point is detected in the target image after the mark hole and before the next mark hole is detected, acquiring a second position of the defect point in the length direction of the pole piece by the control unit according to the position of the defect point in the image and the number of historical shot images; the control unit is further used for acquiring a distance L2 between the defect point and a mark hole of next die cutting according to the die cutting length L1, the first position and the second position of the laser die cutting unit;
and if the distance L2 is greater than the distance D, the control unit controls the laser die cutting unit to execute re-cutting.
2. The die cutting device for the lithium battery pole pieces, as recited in claim 1, wherein:
and if the distance L2 is smaller than the distance D, the control unit controls the laser die cutting unit to die cut mark holes at intervals of length L1.
3. The die cutting device for the lithium battery pole pieces, as recited in claim 1, wherein:
the calculation method of the first position is to take the first line of pixels of the first picture of the pole piece, which is shot by the image acquisition unit, as an absolute starting point, calculate the number of the pictures, which are shot before the first position, multiplied by the number of pixel lines contained in each picture, and added with the number of the pixel lines of the picture at the first position, wherein the line direction is the length direction of the pole piece;
the calculation method of the second position is to take the first line of pixels of the first picture of the pole piece shot by the image acquisition unit as an absolute starting point, calculate the number of the pictures shot before the second position by the number of pixel lines contained in each picture, and add the number of the pixel lines of the picture at the second position.
4. The die cutting device for the lithium battery pole piece, according to claim 1, is characterized in that:
the distance L2 is calculated by subtracting the first position from the second position to obtain a distance L3 from the defect point to a mark hole, and then subtracting the distance L3 from the die cutting length L1 to obtain a distance L2.
5. A die cutting method for a lithium battery pole piece is characterized by comprising the following steps:
s1) controlling a laser die cutting unit to die cut mark holes in the pole piece at intervals of length L1; acquiring a target image from an image acquisition unit, wherein the target image is obtained by continuously and repeatedly acquiring a pole piece image by the image acquisition unit, the image acquisition unit is arranged at the downstream of a pole piece transmission line, a laser die cutting unit is also arranged at the upstream of the pole piece transmission line, and the distance D is formed between the die cutting position of the laser die cutting unit and the detection position of the image acquisition unit;
s2) identifying a defect point and a mark hole in the target image, judging whether the mark hole exists in the target image, and if so, acquiring a first position of the mark hole in the length direction of the pole piece according to the position of the mark hole in the image and the number of historical shot images;
s3) identifying the target image behind the mark hole, and if a defect point is detected in the target image after the mark hole and before the next mark hole is detected, acquiring a second position of the defect point in the length direction of the pole piece according to the position of the defect point in the image and the number of the historical shot images;
s4) acquiring a distance L2 between the defect point and a mark hole of the next die cutting according to the die cutting length L1, the first position and the second position of the laser die cutting unit;
s5) if the distance L2 is larger than the distance D, controlling the laser die cutting unit to execute re-cutting.
6. The die cutting method for the lithium battery pole piece according to claim 5, wherein if the distance L2 is less than the distance D, the method further comprises the following steps:
and controlling the laser die cutting unit to die cut mark holes at every interval length L1.
7. The die cutting method of the lithium battery pole piece as claimed in claim 5, wherein:
and if the pole piece defect is not detected in the step S3, repeating the step S1.
8. The die cutting method of the lithium battery pole piece according to claim 6 or 7, wherein the step of obtaining the first position of the mark hole in the length direction of the pole piece according to the position of the mark hole in the image and the number of the historical photographed images comprises the following steps:
and taking a first row of pixels of a first picture of the pole piece, which is shot by the image acquisition unit, as an absolute starting point, calculating the number of the pictures shot before the first position multiplied by the number of pixel rows contained in each picture, and adding the number of the pixel rows of the picture at the first position, wherein the row direction is the length direction of the pole piece.
9. The die cutting method for the lithium battery pole piece according to claim 8, wherein the step of obtaining the second position of the defect point in the length direction of the pole piece according to the position of the defect point in the image and the number of the historical photographed images comprises:
and taking the first row of pixels of the first picture of the pole piece shot by the image acquisition unit as an absolute starting point, calculating the number of the pictures shot before the second position multiplied by the number of pixel rows contained in each picture, and adding the number of the pixel rows of the picture at the second position.
10. The die cutting method of the lithium battery pole piece according to claim 9, wherein obtaining a distance L2 between the defect point and a mark hole of a next die cutting according to the die cutting length L1 of the laser die cutting unit, the first position and the second position comprises:
and subtracting the first position from the second position to obtain a distance L3 from the defect point to a mark hole, and subtracting L3 from the die cutting length L1 to obtain a distance L2.
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| CN202210754772.9A CN114799573B (en) | 2022-06-30 | 2022-06-30 | Die cutting device and method for lithium battery pole piece |
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| CN115690097B (en) * | 2022-12-15 | 2023-03-10 | 宁德时代新能源科技股份有限公司 | Pole piece labeling control method and device, electronic equipment and storage medium |
| CN117564162B (en) * | 2024-01-16 | 2024-04-30 | 宁德时代新能源科技股份有限公司 | Pole piece die cutting method and pole piece die cutting device |
| CN117718386A (en) * | 2024-02-18 | 2024-03-19 | 宁德时代新能源科技股份有限公司 | Die cutting method and die cutting machine |
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| JP2002338111A (en) * | 2001-05-10 | 2002-11-27 | Dainippon Printing Co Ltd | Fault marking method and sheet material clearly marked at fault position |
| JP5279533B2 (en) * | 2009-01-30 | 2013-09-04 | 日立ビークルエナジー株式会社 | Lithium ion battery and method for producing lithium ion battery |
| CN110137427B (en) * | 2018-02-08 | 2022-03-11 | 中天储能科技有限公司 | Preparation method of multi-stage battery pole piece |
| CN110943198A (en) * | 2019-12-04 | 2020-03-31 | 信义电源(苏州)有限公司 | Lithium battery sheet-making equipment |
| CN214263465U (en) * | 2020-10-10 | 2021-09-24 | 恒大新能源技术(深圳)有限公司 | Pole piece die cutting equipment |
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Address after: 510000 3, building 9, two South Road, Dashi street, Dashi street, Guangzhou, Guangdong, Panyu District, China. Patentee after: Guangzhou Yihong Intelligent Equipment Co.,Ltd. Address before: 511449 101-301, building 3, No. 9, Huijiang Shinan Second Road, Dashi street, Panyu District, Guangzhou, Guangdong Patentee before: GUANGZHOU EHOLLY INTELLIGENT EQUIPMENT Co.,Ltd. |