Overhang detection method, apparatus and device for battery electrode sheet, and storage medium

Patent metadata

Field	Value
Publication number	US-12073550-B2
Application number	US-202418595413-A
Country	US
Kind code	B2
Filing date	Mar 4, 2024
Priority date	Apr 25, 2022
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

An Overhang detection method for a battery electrode sheet includes acquiring an image of a battery electrode sheet; determining the locations of a plurality of electrode sheet edges in the image, wherein the plurality of electrode sheet edges are electrode sheet edges related to an Overhang measurement value corresponding to the image, the location of each electrode sheet edge is determined on the basis of an area where each electrode sheet edge is located, and the area where each electrode sheet edge is located is a dynamically determined area; and determining, according to the locations of the plurality of electrode sheet edges, the Overhang measurement value corresponding to the image.

First claim

What is claimed is:

1. An Overhang detection method for a battery electrode sheet, comprising:
acquiring an image of a battery electrode sheet;
determining locations of a plurality of electrode sheet edges in the image, wherein the plurality of electrode sheet edges are electrode sheet edges related to an Overhang measurement value corresponding to the image, a location of each electrode sheet edge is determined based on an area where each electrode sheet edge is located, and the area where each electrode sheet edge is located is a dynamically determined area; and
determining, according to the locations of the plurality of electrode sheet edges, the Overhang measurement value corresponding to the image.

2. The Overhang detection method for the battery electrode sheet according to claim 1 , wherein the area where each electrode sheet edge is located is an area determined based on preset area parameter information, or an area determined based on a location of one or more electrode sheet edges.

3. The Overhang detection method for the battery electrode sheet according to claim 2 , wherein:
the image comprises a first electrode sheet edge and a second electrode sheet edge;
an area where the first electrode sheet edge is located is determined based on the preset area parameter information, and an area where the second electrode sheet edge is located is determined based on a location of the first electrode sheet edge and a first location relationship; and
the first location relationship is a location relationship between the first electrode sheet edge and the second electrode sheet edge.

4. The Overhang detection method for the battery electrode sheet according to claim 3 , wherein:
the image further comprises a third electrode sheet edge;
an area where the third electrode sheet edge is located is determined based on the location of the first electrode sheet edge, a location of the second electrode sheet edge and a second location relationship; and
the second location relationship is a location relationship among the first electrode sheet edge, the second electrode sheet edge and the third electrode sheet edge.

5. The Overhang detection method for the battery electrode sheet according to claim 4 , wherein:
the image further comprises a fourth electrode sheet edge;
an area where the fourth electrode sheet edge is located is determined based on the location of the first electrode sheet edge, the location of the second electrode sheet edge, a location of the third electrode sheet edge and a third location relationship; and
the third location relationship is a location relationship among the first electrode sheet edge, the second electrode sheet edge, the third electrode sheet edge and the fourth electrode sheet edge.

6. The Overhang detection method for the battery electrode sheet according to claim 5 , wherein the first electrode sheet edge is a vertical cathode edge, the second electrode sheet edge comprises a vertical anode edge and a horizontal cathode edge, the third electrode sheet edge comprises a horizontal cathode ceramic edge and a horizontal separator edge, and the fourth electrode sheet edge is a horizontal anode edge.

7. The Overhang detection method for the battery electrode sheet according to claim 6 , wherein determining, according to the locations of the plurality of electrode sheet edges, the Overhang measurement value corresponding to the image, comprises:
determining a distance between a cathode ceramic electrode sheet and a separator according to a location of the horizontal cathode ceramic edge and a location of the horizontal separator edge;
determining a distance between an anode and the separator according to a location of the horizontal anode edge and the location of the horizontal separator edge;
determining a first distance between a cathode and the anode according to a location of the horizontal cathode edge and the location of the horizontal anode edge;
determining a second distance between the cathode and the anode according to a location of the vertical cathode edge and a location of the vertical anode edge;
determining a distance between the anode and the cathode ceramic electrode sheet according to the location of the horizontal anode edge and the location of the horizontal cathode ceramic edge;
determining a cathode sheet width according to the location of the vertical cathode edge;
determining an anode sheet width according to the location of the vertical anode edge; and
according to the distance between the cathode ceramic electrode sheet and the separator, the distance between the anode and the separator, the first distance, the second distance, the distance between the anode and the cathode ceramic electrode sheet, the cathode sheet width and the anode sheet width, determining the Overhang measurement value corresponding to the image.

8. The Overhang detection method for the battery electrode sheet according to claim 1 ,
wherein the image comprises a plurality of images of the battery electrode sheet, and the plurality of images respectively correspond to different areas of the battery electrode sheet;
the detection method further comprising:
according to Overhang measurement values respectively corresponding to the plurality of images, and a location relationship between the different areas, determining an Overhang measurement value corresponding to the battery electrode sheet.

9. The Overhang detection method for the battery electrode sheet according to claim 8 , wherein the plurality of images respectively correspond to four-corner areas of the battery electrode sheet.

10. The Overhang detection method for the battery electrode sheet according to claim 1 , wherein for any electrode sheet edge, a process of determining a location of the electrode sheet edge comprises:
according to a location of an area where the electrode sheet edge is located, determining a location of an edge transition point in the area where the electrode sheet edge is located; and
determining the location of the electrode sheet edge based on the location of the edge transition point and a linear fitting algorithm.

11. An Overhang detection device for a battery electrode sheet, comprising:
a processor; and
a memory in communication connection with the processor and storing instructions that, when executed by the processor, cause the processor to implement the Overhang detection method for the battery electrode sheet according to claim 1 .

12. The Overhang detection device for a battery electrode sheet according to claim 11 , wherein the area where each electrode sheet edge is located is an area determined based on preset area parameter information, or an area determined based on a location of one or more electrode sheet edges.

13. The Overhang detection device for the battery electrode sheet according to claim 12 , wherein:
the image comprises a first electrode sheet edge and a second electrode sheet edge;
an area where the first electrode sheet edge is located is determined based on the preset area parameter information, and an area where the second electrode sheet edge is located is determined based on a location of the first electrode sheet edge and a first location relationship; and
the first location relationship is a location relationship between the first electrode sheet edge and the second electrode sheet edge.

14. The Overhang detection device for the battery electrode sheet according to claim 13 , wherein:
the image further comprises a third electrode sheet edge;
an area where the third electrode sheet edge is located is determined based on the location of the first electrode sheet e

Assignees

• Contemporary Amperex Technology Co Ltd
• Ontemporary Amperex Tech Co Limited

Inventors

• Duan Pengfei
• Chen Qi
• Wang Jianlei
• Dai Ya
• Lei Yang

Classifications

• G06T7/00

  Image analysis · CPC title

• G06T7/62

  of area, perimeter, diameter or volume · CPC title

• G06T7/0004 Primary

  Industrial image inspection · CPC title

• G06T2207/30108

  Industrial image inspection · CPC title

• G06T7/12

  Edge-based segmentation · CPC title