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EP-4386926-B1 - MARKING PROCESSING METHOD AND APPARATUS FOR CONTINUOUS COMPOSITE MATERIAL BELT, AND COMPUTER DEVICE

EP4386926B1EP 4386926 B1EP4386926 B1EP 4386926B1EP-4386926-B1

Inventors

  • ZHAO, Baiquan
  • XIE, Xianfeng
  • LI, Hongyuan
  • HU, JUN
  • FENG, Shiping
  • WU, QIAN

Dates

Publication Date
20260506
Application Date
20220408

Claims (15)

  1. A marking method of a continuous composite strip including one or more sequentially arranged electrode sheet structures, the strip to be transported in a preset strip travel direction, the method comprising: collecting (202, 502, 1202) a first sequence of images of the continuous composite strip in the travel direction of the strip; splicing (204, 504, 1204) multiple images of the first sequence of images according to a collection sequence, to obtain a to-be-detected image with at least one electrode sheet structure; performing edge detection of the to-be-detected image through an edge detection algorithm to detect an electrode sheet edge in the strip travel direction; and marking (206, 518, 1218), in case where two collection-sequential electrode sheet edges are identified in the to-be-detected image, the position of the collection-sequentially second electrode sheet edge in the continuous composite strip as an electrode sheet division position of the continuous composite strip.
  2. The method according to claim 1, wherein the method further comprises: splicing (514), in case where only one electrode sheet edge is identified in the to-be-detected image, the to-be-detected image with a next frame of image adjacent to the to-be-detected image in the first sequence of images, and updating the to-be-detected image.
  3. The method according to claim 1, wherein the method further comprises: taking (524) an image at the second electrode sheet edge as a first frame of image for splicing a next to-be-detected image, and returning to step of splicing (504) multiple images of the first sequence of images according to the collection sequence to obtain the to-be-detected image with at least one electrode sheet structure.
  4. The method according to claim 1, wherein the first sequence of images is collected for a first side of the continuous composite strip, and the method further comprises: collecting a second sequence of images of the continuous composite strip during transportation to a stacking process; the second sequence of images is collected for a second side of the continuous composite strip, and the first side and the second side are opposite sides of the continuous composite strip; splicing, for the second sequence of images, multiple images of the second sequence of images according to the collection sequence, to obtain a to-be-detected image with at least one electrode sheet structure; marking, in case where two electrode sheet edges are identified in the to-be-detected image, a position of the collection-sequentially second electrode sheet edge in the continuous composite strip as an electrode sheet division position of the continuous composite strip to obtain the electrode sheet division position on the second side of the continuous composite strip; and determining, in case where the electrode sheet division position on the first side of the continuous composite strip is same as the electrode sheet division position on the second side, the electrode sheet division position of the continuous composite strip.
  5. The method according to claim 1, wherein the method further comprises: outputting (514) the to-be-detected image and performing an abnormality detection of the continuous composite strip in case where no electrode sheet edge is identified in the to-be-detected image.
  6. The method according to any one of claims 1-5, wherein the method further comprises: determining (520, 1220) an edge spacing between the collection-sequentially first electrode sheet edge and second electrode sheet edge according to the electrode sheet division position; extracting (522, 1222) an image between the first electrode sheet edge and the second electrode sheet edge and outputting the image of electrode sheet unit in case where the edge spacing meets a spacing requirement of electrode sheet division of the continuous composite strip.
  7. The method according to claim 6, wherein determining (520, 1220) the edge spacing between the first electrode sheet edge and the second electrode sheet edge comprises: obtaining respectively position coordinates of the first electrode sheet edge and the second electrode sheet edge in the to-be-detected image; and determining the edge spacing between the first electrode sheet edge and the second electrode sheet edge according to the position coordinates.
  8. The method according to claim 6, wherein after extracting (522, 1222) the image between the first electrode sheet edge and the second electrode sheet edge and outputting the image of electrode sheet unit in case where the edge spacing meets the spacing requirement of the electrode sheet division of the continuous composite strip, the method further comprises: extracting (902) image features of the image of electrode sheet unit; detecting (904) whether the image of electrode sheet unit meets cell division conditions according to the image features; determining (906), in case where the cell division conditions are met, whether a summed length of multiple successive electrode sheet units in the continuous composite strip meets a requirement on length of a cell; wherein, one cell comprises a preset number of electrode sheet units; and marking (908) a cell division position in case where the requirement on the length of the cell is met.
  9. The method according to claim 8, wherein detecting (904) whether the image of electrode sheet unit meets the cell division conditions according to the image features comprises: detecting whether a difference of numbers of anode tabs (203) and cathode tabs (205) of the image features meets a requirement on difference of numbers of cell division conditions, detecting, in case where the requirement on the difference of the numbers of the cell division conditions is met, whether an end mark of the cell of the image features meets a requirement on end mark of the cell division conditions, and determining, in case where the requirement on the end mark of the cell division conditions is met, that the cell division conditions are met.
  10. The method according to claim 9, wherein marking (908) the cell division position comprises: marking a position of the end mark of the cell of the image features in the continuous composite strip as the cell division position. or wherein prior to marking (908) the cell division position, the method further comprises: obtaining the number of pulses triggering an image collection unit to collect images of the continuous composite strip in the travel direction of the strip for image collection of the continuous composite strip during transportation to stacking process; and detecting whether the number of the pulses for image collection meets a requirement on pulses of cell division.
  11. A marking apparatus of a continuous composite strip including one or more sequentially arranged electrode sheet structures, comprising: an image collection module (1302), used for collecting a first sequence of images of the continuous composite strip during transportation to a stacking process in the travel direction of the strip; a to-be-detected image determination module (1304), used for splicing multiple images of the first sequence of images according to the collection sequence, to obtain a to-be-detected image with at least one electrode sheet structure; means for performing edge detection of the to-be-detected image through an edge detection algorithm to detect an electrode sheet edge in the strip travel direction; and an electrode sheet division module (1306), used for marking, in case where two collection-sequential electrode sheet edges are identified in the to-be-detected image, a position of the collection-sequentially second electrode sheet edge in the continuous composite strip as an electrode sheet division position of the continuous composite strip.
  12. A computer device comprising a memory storing a computer program and a processor which implements steps of the method according to any one of claims 1-10 when executing the computer program.
  13. A marking system of a continuous composite strip comprising an image collection component, an encoder, a memory and the computer device according to claim 12, wherein the image collection component supports the continuous composite strip, and the continuous composite strip drives the encoder to operate during travel of the strip to trigger the image collection component to collect images.
  14. A computer-readable storage medium on which a computer program is stored, wherein the computer program implements steps of the method according on any one of claims 1-10 when executed by a processor.
  15. A computer program product comprising a computer program, wherein the computer program, when executed by a processor, implements steps of the method according to any one of claims 1-10.

Description

TECHNICAL FIELD The present disclosure relates to the technology field of lithium battery, and more particularly, relates to a marking method and apparatus of continuous composite strip, computer device, storage media, and computer program product. BACKGROUND With the development of new energy technology and environmental protection requirements, lithium batteries are widely used. For example, lithium batteries are used in new energy vehicles, mobile phones, laptop computers and so on. Therefore, the quality of the batteries is crucial, and how to efficiently and accurately check the quality of the batteries in the production process has become an urgent problem for battery manufacturers to solve. In the quality assessment of a battery, it is the quality of the basic electrode sheets that is tested in the production process. As concerns the stacking process, the quality of the electrode sheets is affected by the division accuracy of the electrode sheets to a certain extent. Traditional division methods are applicable to the winding process, and the prior art methods may not be used for sheet division marking of a continuous composite strip. DE 10 2017 223 834 A1 describes a method of determining a lateral misalignment of different layers of a strip to be wound on a coil by means of image processing, wherein the strip comprises two separation layers, an anode layer and a cathode layer stacked on top of each other. The distances of the edges of the anode and of the cathode layer are determined in short intervals or when a predetermined image capture execution angle of the coil core has been reached. A strip is discarded as defective if one of these distances is outside a permissible range in any of the captured images. The conveying distance of the strip and its various layers is determined by a rotary encoder for pressure rolls which keep the various layers in a stacked condition and feed the stacked layers to the coil. SUMMARY The invention is defined by the set of appended claims. In view of the above, it is necessary to provide a marking method and apparatus of a continuous composite strip, a computer device, a computer-readable storage media, and a computer program product, which may realize the sheet division marking of the continuous composite strip for the above technical problems. In a first aspect, the disclosure provides a marking method according to claim 1 In this method, the first sequence of images is obtained by collecting the images of the continuous composite strip; the to-be-detected image with at least one electrode sheet structure is obtained by splicing multiple images of the first sequence of images according to the collection sequence; in case where two electrode sheet edges are identified in the to-be-detected image, the position of the collection-sequentially second electrode sheet edge in the continuous composite strip is marked as the electrode sheet division position of the continuous composite strip. By using the image identification technology and according to the distribution characteristics of the electrode sheets in the continuous composite strip, the electrode sheet edges in the continuous composite strip is identified and the electrode sheet division position is determined, the specific position information of the electrode sheet is obtained, and the sheet division marking of the continuous composite strip is accurately performed. In one of the embodiment, the method of the continuous composite strip further includes: Splicing, in case where only one electrode sheet edge is identified in the to-be-detected image, the to-be-detected image with a next frame of image adjacent to the to-be-detected image in the first sequence of images, and updating the to-be-detected image. In the above embodiment, in case where only one electrode sheet edge is identified in the to-be-detected image, a new to-be-detected image is obtained by splicing the to-be-detected image with a next frame of image adjacent to the to-be-detected image. By re-performing the electrode sheet edge identification of the obtained new to-be-detected image, the accuracy of the sheet division marking of the continuous composite strip is increased. In one of the embodiments, the method of the continuous composite strip further includes: taking an image at the second electrode sheet edge as a first frame of image for splicing a next to-be-detected image, and returning to the step of splicing multiple images of the first sequence of images according to the collection sequence to obtain the to-be-detected image with at least one electrode sheet structure. In the above embodiments, in case where a previous electrode sheet division position of the continuous composite strip is determined, the image at the second electrode sheet edge corresponding to the previous electrode sheet division position is used as the first frame of image for splicing the next to-be-detected image. Return to the step of splicing multiple images i