US 11,657,494 B1
Method to detect defects in battery pouch cells using angled flash thermography
Selina Xinyue Zhao, Rochester Hills, MI (US); Ratandeep Singh Kukreja, Auburn Hills, MI (US); and Xiaosong Huang, Novi, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Jan. 14, 2022, as Appl. No. 17/576,176.
Int. Cl. G06T 7/00 (2017.01); G06V 10/22 (2022.01); G06V 10/60 (2022.01); H01M 10/42 (2006.01); H01M 50/105 (2021.01); H04N 23/56 (2023.01); H01M 50/533 (2021.01); H04N 23/74 (2023.01)
CPC G06T 7/0004 (2013.01) [G06V 10/22 (2022.01); G06V 10/60 (2022.01); H01M 10/4285 (2013.01); H01M 50/105 (2021.01); H01M 50/533 (2021.01); H04N 23/56 (2023.01); H04N 23/74 (2023.01); G06T 2207/10048 (2013.01); G06T 2207/30108 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A defect detection system for a battery cell, the defect detection system comprising:
a flash thermography device configured to apply a flash of light to a target area on a surface of the battery cell;
an imaging device configured to capture an image of the target area subsequent to the flash of light being applied to the surface of the battery cell; and
a defect detection control module configured to
receive the image captured by the imaging device,
analyze the image to determine whether a defect is present in the battery cell, and
selectively generate and output an indication of whether the defect is present based on the analysis of the image,
wherein:
the imaging device is an infrared (IR) camera and the image is a thermal image;
the defect detection control module includes an image analysis module configured to analyze the thermal image;
the image analysis module is configured to perform a first analysis on the thermal image based on a thermal signature of the thermal image;
the image analysis module is configured to identify features of the thermal image indicative of the defect based on the thermal signature;
the image analysis module is configured to perform a second analysis on the thermal image in response to a determination that the identified features indicate that the battery cell includes the defect;
the image analysis module is configured to determine whether the battery cell includes the defect based on whether a signal to noise ratio of the thermal image exceeds a threshold; and
the image analysis module is configured to determine a type of the defect based on signal to noise ratios in respective subregions of the thermal image.