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Side and Top Panel Welding Inspection

Assess prismatic battery cell panel welds with deep learning solutions

After the top and side panels are welded onto an EV battery, deep learning ensures they have been welded to specification

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In a prismatic battery cell, a rectangular case is welded around an electrode sheet. Then the top panel is welded on. The lid has to allow for some expansion and contraction of the cell as it heats up and cools down in use. This is a particularly important consideration since the shape of prismatic cells means they can be layered tightly, in a space-efficient matter. The seam welds on both the side panel and the top panel must be inspected for any defects before the battery cell is installed in a module.

Proper assessment of the seam welds on each cell is key to the functionality and lifespan of the entire battery. All of these welds can vary significantly in appearance. There can be a wide range of defects, but also variations that do not affect performance.

Combining 2D and 3D vision systems with deep learning technology detects many more potential defect types than using just one technology. Cognex Deep Learning’s defect detection and segmentation functions are trained on a wide range of good and defective weld variations and learn to accurately classify and distinguish functional flaws from merely cosmetic ones.

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