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CN-116762205-B - Method, device and equipment for detecting winding coverage of battery winding core

CN116762205BCN 116762205 BCN116762205 BCN 116762205BCN-116762205-B

Abstract

The application relates to the field of batteries, in particular to a method, a device and equipment for detecting winding coverage of a battery winding core. In the detection method, the first reference line of the first image acquisition device and the second reference line of the second image acquisition device are set to coincide in the same coordinate system, so that the first distance calculated by taking the first reference line as a reference in the anode coating layer side image and the third distance calculated by taking the second reference line as a reference in the cathode coating layer side image are equivalent to follow the same reference line in the same coordinate system, and therefore whether the first anode coating boundary covers the first cathode coating boundary can be accurately judged through the first distance and the third distance. Similarly, it can be accurately determined whether the second anode coating boundary covers the second cathode coating boundary by the second distance and the fourth distance. By the mode, the covering condition between the anode pole piece and the cathode pole piece in the winding process of the battery winding core can be accurately detected.

Inventors

  • CHEN JIWEI
  • WANG XUMING
  • XIE JINTAN
  • ZHANG YUANYUAN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260505
Application Date
20211029

Claims (16)

  1. 1. A battery winding core coverage detection method is characterized by comprising an anode pole piece with an anode coating, a cathode pole piece with a cathode coating and a diaphragm positioned between the anode pole piece and the cathode pole piece; the detection method is applied to a winding preparation stage of a battery winding core, and comprises the following steps: acquiring an anode coating side image and a cathode coating side image, wherein the anode coating side image comprises an image of an anode sheet in a state of being about to be rolled or in a state of being rolled, and the cathode coating side image comprises an image of a cathode sheet in a state of being about to be rolled; Determining a first distance between a first anode coating boundary far from a tab in the anode coating side and a first datum line and a second distance between a second anode coating boundary close to the tab in the anode coating side and the first datum line according to the anode coating side image, wherein the first datum line is a datum line calibrated by a first image acquisition device for acquiring the anode coating side image; determining a third distance between a first cathode coating boundary far from a tab in the cathode coating side and a second reference line and a fourth distance between a second cathode coating boundary close to the tab in the cathode coating side and the second reference line according to the cathode coating side image, wherein the second reference line is a reference line calibrated by a second image acquisition device for acquiring the cathode coating side image, and the first reference line and the second reference line are overlapped in the same coordinate system; Determining whether the first anode coating boundary covers the first cathode coating boundary according to the first distance and the third distance; and determining whether the second anode coating boundary covers the second cathode coating boundary according to the second distance and the fourth distance.
  2. 2. The method of claim 1, wherein an anode pole piece included in the anode coating side image is in the same winding section in the battery winding core as a cathode pole piece included in the cathode coating side image; the winding section comprises at least one pair of target anode lugs and target cathode lugs, and the target anode lugs and the target cathode lugs are adjacent.
  3. 3. The method of claim 2, wherein determining a first distance between a first anode coating boundary of the anode coating side distal from the tab and a first reference line and a second distance between a second anode coating boundary of the anode coating side proximal to the tab and the first reference line from the anode coating side image comprises: calculating the first distance by a distance between the first anode coating boundary located between a target anode tab and a target cathode tab and the first reference line in the anode coating side image; And calculating the second distance through the distance between the second anode coating boundary between the target anode tab and the target cathode tab and the first reference line in the anode coating side image.
  4. 4. The method of claim 3, wherein the step of, The calculating the first distance by a distance between the first anode coating boundary between the target anode tab and the target cathode tab and the first reference line in the anode coating side image includes: Determining anode coating pixel equivalent according to the distance between the first anode coating boundary and the second anode coating boundary and the number of pixel points occupied by the anode coating in the anode coating side image; determining the first distance as the product of the number of pixel points between the first anode coating boundary and the first reference line between the target anode tab and the target cathode tab and the anode coating pixel equivalent in the anode coating side image; Or alternatively, the first and second heat exchangers may be, The calculating the second distance by a distance between the second anode coating boundary located between the target anode tab and the target cathode tab and the first reference line in the anode coating side image includes: Determining anode coating pixel equivalent according to the distance between the first anode coating boundary and the second anode coating boundary and the number of pixel points occupied by the anode coating in the anode coating side image; And determining the second distance as the product of the number of pixel points between the second anode coating boundary between the target anode tab and the target cathode tab and the first datum line and the anode coating pixel equivalent in the anode coating side image.
  5. 5. The method of claim 2, wherein determining a third distance between a first cathode coating boundary of the cathode coating side distal from the tab and a second reference line and a fourth distance between a second cathode coating boundary of the cathode coating side proximal to the tab and the second reference line from the cathode coating side image comprises: calculating the third distance by the distance between the first cathode coating boundary and the second reference line between the target anode tab and the target cathode tab in the cathode coating side image; And calculating the fourth distance through the distance between the second cathode coating boundary between the target anode tab and the target cathode tab and the second reference line in the cathode coating side image.
  6. 6. The method of claim 5, wherein the step of determining the position of the probe is performed, The calculating the third distance from the distance between the first cathode coating boundary and the second reference line between the target anode tab and the target cathode tab in the cathode coating side image includes: Determining cathode coating pixel equivalent according to the distance between the first cathode coating boundary and the second cathode coating boundary and the number of pixel points occupied by the cathode coating in the cathode coating side image; determining the third distance as the product of the number of pixel points between the first cathode coating boundary and the second reference line between the target anode tab and the target cathode tab and the anode coating pixel equivalent in the cathode coating side image; Or alternatively, the first and second heat exchangers may be, The calculating the fourth distance from the distance between the second cathode coating boundary between the target anode tab and the target cathode tab and the second reference line in the cathode coating side image includes: Determining cathode coating pixel equivalent according to the distance between the first cathode coating boundary and the second cathode coating boundary and the number of pixel points occupied by the cathode coating in the cathode coating side image; and determining the fourth distance as the product of the number of pixel points between the second cathode coating boundary between the target anode tab and the target cathode tab and the second reference line and the pixel equivalent of the cathode sheet in the cathode coating side image.
  7. 7. The method of claim 1, wherein the determining whether the first anode coating boundary covers the first cathode coating boundary based on the first distance and the third distance comprises: And if the difference value obtained by subtracting the third distance from the first distance is greater than or equal to a first preset threshold value, determining that the first anode coating boundary covers the first cathode coating boundary.
  8. 8. The method of any of claims 1-7, wherein determining whether the second anode coating boundary covers the second cathode coating boundary based on the second distance and the fourth distance comprises: And if the difference value obtained by subtracting the fourth distance from the second distance is greater than or equal to a second preset threshold value, determining that the second anode coating boundary covers the second cathode coating boundary.
  9. 9. The method of claim 1, wherein when an insulating coating is disposed between the second cathode coating boundary and a cathode tab, the method further comprises: determining a fifth distance between the boundary of the insulating coating close to the cathode tab and the second datum line according to the cathode coating side image; And determining whether the boundary of the insulating coating close to the cathode tab covers the boundary of the second anode coating according to the fifth distance and the second distance.
  10. 10. The method of claim 9, wherein determining whether the boundary of the insulating coating proximate the cathode tab covers the second anode coating boundary based on the fifth distance and the second distance comprises: And if the difference value obtained by subtracting the second distance from the fifth distance is larger than or equal to a third preset threshold value, determining that the boundary of the insulating coating close to the cathode tab covers the boundary of the second anode coating.
  11. 11. The method of claim 1, wherein the first reference line is a field of view midline of the first image capturing device and the second reference line is a field of view midline of the second image capturing device.
  12. 12. The method of claim 1, wherein a field-of-view centerline of the first image acquisition device is located at a circumferential centerline position of the anode electrode sheet and a field-of-view centerline of the second image acquisition device is located at a circumferential centerline position of the cathode electrode sheet.
  13. 13. The method of claim 11 or 12, wherein the first image acquisition device comprises an infrared light source and a first line scan camera and the second image acquisition device comprises a visible light source and a second line scan camera.
  14. 14. A battery core winding coverage detection device, characterized by comprising: An image acquisition module for acquiring an anode coating side image and a cathode coating side image, wherein the anode coating side image comprises an image of an anode pole piece in a state of being about to be rolled or in a state of being rolled, and the cathode coating side image comprises an image of a cathode pole piece in a state of being about to be rolled; The boundary distance determining module is used for determining a first distance between a first anode coating boundary far away from the tab in the anode coating side and a first datum line and a second distance between a second anode coating boundary close to the tab in the anode coating side and the first datum line according to the anode coating side image, wherein the first datum line is a datum line calibrated by a first image acquisition device for acquiring the anode coating side image; The boundary distance determining module is further configured to determine, according to the cathode coating side image, a third distance between a first cathode coating boundary far from the tab in the cathode coating side and a second reference line, and a fourth distance between a second cathode coating boundary near to the tab in the cathode coating side and the second reference line, where the second reference line is a reference line calibrated by a second image capturing device for capturing the cathode coating side image, and the first reference line and the second reference line overlap in the same coordinate system, and A coverage determination module for determining whether the first anode coating boundary covers the first cathode coating boundary according to the first distance and the third distance; The coverage determination module is further configured to determine whether the second anode coating boundary covers the second cathode coating boundary according to the second distance and the fourth distance.
  15. 15. The battery winding coverage detection device is characterized by comprising an anode pole piece with an anode coating, a cathode pole piece with a cathode coating and a diaphragm positioned between the anode pole piece and the cathode pole piece; The detection apparatus includes: the first image acquisition device is used for acquiring an anode coating side image, wherein the anode coating side image comprises an image of an anode plate in a rolled state or a rolled state, and a first datum line is a datum line calibrated by the first image acquisition device; The second image acquisition device is used for acquiring a cathode coating side image, the cathode coating side image comprises an image of a cathode pole piece in a rolled state, the second datum line is a datum line calibrated by the second image acquisition device, and the first datum line and the second datum line are overlapped in the same coordinate system; The processor is respectively in communication connection with the first image acquisition device and the second image acquisition device to acquire the anode coating side image, the cathode coating side image, the first datum line and the second datum line; a memory communicatively coupled to the processor, the memory storing instructions executable by the processor to enable the processor to perform the method of any one of claims 1-13.
  16. 16. A battery core winder comprising the battery core winding coverage detection apparatus according to claim 15.

Description

Method, device and equipment for detecting winding coverage of battery winding core Technical Field The application relates to the field of batteries, in particular to a method, a device and equipment for detecting winding coverage of a battery winding core. Background At present, batteries are mainly used as power on electric automobiles, and the batteries have the characteristics of high capacity, high output voltage, good charge-discharge cycle performance and the like. In the production process of a battery, an anode pole piece, a cathode pole piece and a diaphragm are generally required to be wound into a winding core. In the battery winding technology, it is generally required to detect the covering condition of the winding core in the winding process, and generally, the anode coating boundary should cover the cathode coating boundary, if the covering is poor, the winding core is easy to puncture the separator during the cyclic charge and discharge, and even explosion is caused during the serious condition, so that the safety of the battery is greatly affected. Disclosure of Invention In view of the above problems, the application provides a method, a device and equipment for detecting the winding coverage of a battery winding core, which can accurately detect the coverage condition between an anode pole piece and a cathode pole piece in the winding process of the battery winding core. In a first aspect, the application provides a battery winding core coverage detection method, the detected battery winding core comprises an anode pole piece with an anode coating, a cathode pole piece with a cathode coating and a diaphragm positioned between the anode pole piece and the cathode pole piece, and the detection method is applied to a winding preparation stage of the battery winding core. The method comprises the following steps: an anode coating side image including an image of the anode electrode sheet in an impending rolled state or a rolled state and a cathode coating side image including an image of the cathode electrode sheet in an impending rolled state are acquired. And determining a first distance between a first anode coating boundary far away from the tab in the anode coating side and a first datum line and a second distance between a second anode coating boundary close to the tab in the anode coating side and the first datum line according to the anode coating side image, wherein the first datum line is a datum line calibrated by a first image acquisition device for acquiring the anode coating side image. And determining a third distance between a first cathode coating boundary far from the tab in the cathode coating side and a second datum line and a fourth distance between a second cathode coating boundary close to the tab in the cathode coating side and the second datum line according to the cathode coating side image, wherein the second datum line is a datum line calibrated by a second image acquisition device for acquiring the cathode coating side image, and the first datum line and the second datum line are overlapped in the same coordinate system. And determining whether the second anode coating boundary covers the second cathode coating boundary based on the second distance and the fourth distance. In the above-mentioned detection method, the first reference line of the first image capturing device for capturing the image on the anode coating layer side and the second reference line of the second image capturing device for capturing the image on the cathode coating layer side are set to coincide in the same coordinate system (for example, the first reference line and the second reference line coincide in the world coordinate system), so that the first distance calculated by taking the first reference line as a reference in the image on the anode coating layer side and the third distance calculated by taking the second reference line as a reference in the image on the cathode coating layer side are equivalent to follow the same reference line in the same coordinate system. And, since the first reference line and the second reference line are determined, it can be accurately judged whether the first anode coating boundary covers the first cathode coating boundary by the first distance and the third distance. Similarly, the second distance calculated with the first reference line as a reference in the anode coating side image and the fourth distance calculated with the second reference line as a reference in the cathode coating side image correspond to follow the same reference line in the same coordinate system, and since the first reference line and the second reference line are determined, it can be accurately determined whether the second anode coating boundary covers the second cathode coating boundary or not by the second distance and the fourth distance. The covering condition between the anode pole piece and the cathode pole piece in the winding process of the battery winding core c