F-150 Lightning Recall Due to SK Cells

Re:F-150 Lightning Recall Due to SK Cells by londons_explore on Thursday March 23, 2023 @09:24AM (#35274380)

If I were to guess, this issue will be because metal tabs inside the cells were cut to shape with a stamping machine. The stamping machine die was probably worn, leaving burrs on the edges of the tabs. Those burrs are sharp and perforate plastic membranes, causing a short.

Lesson:. All stamped parts should be deburred.

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Re:F-150 Lightning Recall Due to SK Cells by dboreham on Thursday March 23, 2023 @10:05AM (#35275006)

Don't the drawings say "Debur all edges"?

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Re:F-150 Lightning Recall Due to SK Cells by dsfyu404ed on Thursday March 23, 2023 @11:00AM (#35275863)

>Lesson:. All stamped parts should be deburred.

This take is like the manufacturing equivalent of when people say we need a law to prevent something that's already illegal.

The run of parts was mostly in spec. All they have to do is change their tools a little more aggressively or tighten up the parameters on their existing QC process.

Adding an extra step to a low margin high volume part where cost is dominated by number of operations in the manufacturing process is needless and wasteful when you can just do what you're already doing but at an ever so slightly higher level of quality.

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Re:F-150 Lightning Recall Due to SK Cells by tomatotomato37 on Thursday March 23, 2023 @01:43PM (#35278481)

Also for all we know they could already be doing this and the defect actually occured because of it, E.G. misaligned deburring head bending the metal into an edge

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