Sutho wrote:P.s. Length measurement on the 7s3p is apparently 230mm. So I was out by 10mm on my guesstimation.
Thanks. Very good estimate & you only overshot 10mm, not bad.
Since this defect is caused by a torch misalignment, then the root of the defect had to be isolated in that area of the welds at the top of the tabs. The defect can then apparently only occur once the cell stack is in compression inside the modules. So, maybe there is some tensional forces being exerted on the underneath side of the flimsy tabs that are welded to the bus bar above & this is causing some flex, tension, or torsion forces downward into the pouches where the defect can be created or maybe its located back up near the tab area from underneath the welds. I really think just relieving tension on the cell stack may be the trick & treat for a truly magical solution. (I keep repeating myself on this idea in case you haven't read that several times by now. )
While waiting for modules we could further speculate & bet cells about this too...
What could the torch misalignment do to these tabs, because that is the starting point of the problem? This assumes that's the only welding that is done on the cells, right? If so, let the speculation betting begin. Let's deal this hand of 5 card draw with deuces & one eyed jacks wild at least.
Everyone throw one cell into the pot & see who can win this hand. Cheaters will be shocked but A123 inside straights are most welcome!