Method and apparatus for inspecting tab appearance of cell assembly, and electronic device

Patent metadata

Field	Value
Publication number	US-11915410-B2
Application number	US-202318138501-A
Country	US
Kind code	B2
Filing date	Apr 24, 2023
Priority date	Jul 21, 2022
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

A method and an apparatus for inspecting tab appearance of cell assembly, an electronic device, a non-transitory computer-readable storage medium, and a computer program product are provided. The method includes: obtaining an image for inspection that includes a background region and a cell assembly image region, where the cell assembly image region includes a body zone and a plurality of tab stacking regions, each tab stacking region adjoining a top edge or a bottom edge of the body zone; determining each root corner of the plurality of tab stacking regions in the image for inspection; determining two side edges of the body zone in the image for inspection; determining at least one reference edge line in the image for inspection based on the two side edges of the body zone in the image for inspection; and determining result information of the tab appearance inspection based on each root corner of the plurality of tab stacking regions in the image for inspection and the at least one reference edge line.

First claim

What is claimed is:

1. A method for inspecting tab appearance of cell assembly, comprising:
obtaining an image for inspection that comprises a background region and a cell assembly image region, wherein the cell assembly image region comprises a body zone and a plurality of tab stacking regions, each tab stacking region adjoining a top edge or a bottom edge of the body zone;
determining each root corner of the plurality of tab stacking regions in the image for inspection;
determining two side edges of the body zone in the image for inspection;
determining at least one reference edge line in the image for inspection based on the two side edges of the body zone in the image for inspection; and
determining result information of the tab appearance inspection based on each root corner of the plurality of tab stacking regions in the image for inspection and the at least one reference edge line.

2. The method according to claim 1 , wherein the obtaining an image for inspection comprises:
performing binarization processing on the image for inspection to obtain a binarized image, wherein the cell assembly image region is used as a region of interest of the binarized image.

3. The method according to claim 2 , wherein the determining each root corner of the plurality of tab stacking regions in the image for inspection comprises:
in the binarized image, performing matching and positioning on a corresponding template image in each local search region based on a template image and a local search region that are correspondingly configured for each root corner; and
determining each root corner of the plurality of tab stacking regions in the binarized image based on a matching and positioning result for the template image in each local search region.

4. The method according to claim 2 , wherein the determining two side edges of the body zone in the image for inspection comprises:
extracting the cell assembly image region from the binarized image;
scrolling the cell assembly image region in the binarized image by one pixel column in a row direction to obtain a contrast image;
determining a plurality of edge pixels of the cell assembly image region in the binarized image based on a gray level difference between the binarized image and the contrast image; and
filtering out edge pixels that are arranged in a first direction but have a spacing less than a distance threshold from the plurality of edge pixels to obtain the two side edges of the body zone in the binarized image, wherein the first direction essentially extends in a same direction as the top edge and bottom edge of the body zone.

5. The method according to claim 1 , wherein the obtaining an image for inspection comprises:
performing rotation correction on the image for inspection so that the top edge and bottom edge of the body zone are basically parallel to a row direction and the two side edges of the body zone are basically orthogonal to the row direction.

6. The method according to claim 1 , wherein shooting exposure time for the image for inspection is not less than 8,000 microseconds and not greater than 12,000 microseconds.

7. The method according to claim 1 , wherein the result information of the tab appearance inspection comprises:
distance between two root corners in each tab stacking region; and/or
pass or fail assessment result for tab appearance.

8. The method according to claim 1 , wherein:
the cell assembly image region comprises two tab stacking regions: a positive tab stacking region and a negative tab stacking region, wherein both the positive tab stacking region and the negative tab stacking region adjoin the top edge or bottom edge of the body zone, or the positive tab stacking region adjoins the top edge of the body zone and the negative tab stacking region adjoins the bottom edge of the body zone.

9. An electronic device comprising a memory and a processor, the memory storing a computer program, and the processor, when executing the computer program, implementing a method for inspecting tab appearance of cell assembly, the method including:
obtaining an image for inspection that comprises a background region and a cell assembly image region, wherein the cell assembly image region comprises a body zone and a plurality of tab stacking regions, each tab stacking region adjoining a top edge or a bottom edge of the body zone;
determining each root corner of the plurality of tab stacking regions in the image for inspection;
determining two side edges of the body zone in the image for inspection;
determining at least one reference edge line in the image for inspection based on the two side edges of the body zone in the image for inspection; and
determining result information of the tab appearance inspection based on each root corner of the plurality of tab stacking regions in the image for inspection and the at least one reference edge line.

10. The electronic device according to claim 9 , wherein the obtaining an image for inspection comprises:
performing binarization processing on the image for inspection to obtain a binarized image, wherein the cell assembly image region is used as a region of interest of the binarized image.

11. The electronic device according to claim 10 , wherein the determining each root corner of the plurality of tab stacking regions in the image for inspection comprises:
in the binarized image, performing matching and positioning on a corresponding template image in each local search region based on a template image and a local search region that are correspondingly configured for each root corner; and
determining each root corner of the plurality of tab stacking regions in the binarized image based on a matching and positioning result for the template image in each local search region.

12. The electronic device according to claim 10 , wherein the determining two side edges of the body zone in the image for inspection comprises:
extracting the cell assembly image region from the binarized image;
scrolling the cell assembly image region in the binarized image by one pixel column in a row direction to obtain a contrast image;
determining a plurality of edge pixels of the cell assembly image region in the binarized image based on a gray level difference between the binarized image and the contrast image; and
filtering out edge pixels that are arranged in a first direction but have a spacing less than a distance threshold from the plurality of edge pixels to obtain the two side edges of the body zone in the binarized image, wherein the first direction essentially extends in a same direction as the top edge and bottom edge of the body zone.

13. The electronic device according to claim 9 , wherein the obtaining an image for inspection comprises:
performing rotation correction on the image for inspection so that the top edge and bottom edge of the body zone are basically parallel to a row direction and the two side edges of the body zone are basically orthogonal to the row direction.

14. The electronic device according to claim 9 , wherein shooting exposure time for the image for inspection is not less than 8,000 microseconds and not greater than 12,000 microseconds.

15. The electronic device according to claim 9 , wherein the result information of the tab appearance inspection comprises:
distance between two root corners in each tab stacking region; and/or
pass or fail assessment result for tab appearance.

16. The electronic device according to claim 9 , wherein:
the cell assembly image region comprises two tab stacking regions: a positive tab stacking region and a negative ta

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Li Lu
• Wang Zhiyu
• Jiang Guannan

Classifications

• G06T7/0008 Primary

  checking presence/absence · CPC title

• G06T3/60

  Rotation of whole images or parts thereof · CPC title

• G06T5/20

  using local operators · CPC title

• G06T7/13

  Edge detection · CPC title

• G06V10/25

  Determination of region of interest [ROI] or a volume of interest [VOI] · CPC title