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I'm curious what the wire material is. Aluminum? Plated Copper? What plating?
Good eye, how about this oneFor reference, you're measuring the wire bond size of a Model 3 module, over an S/X module....
View attachment 440827
Good eye, how about this one
Is it literally just a fuse and blows if too much current flows in the cell?
What other methods exist in the pack to bypass defective elements? Can a single block of 46p elements be entirely bypassed somehow?
Came marked from Tesla, the ones circled are ones that failed QA I believe, as there are two ultrasonic weld marks present vs the normal one.I want to know why there are red circles around some of the cells?
Typically if there is just one, it can be plucked and isolated, and no effect on safety or range.
Wait, what? Occasionally 2170 cells (I guess the picture above was not 2170, but I'm referring to a Model 3 pack) are just left disconnected in the pack and it's ok? I guess you said "potentially weak". What if the wire bond is obviously weak or disconnected? Is the wire bond redone in that case, even if it's just a single cell? What's the maximum number of cells out of 4416 that can be left disconnected? (It sounds like there are also separate requirements on the number allowed within a parallel group of 46?)
This is the wrong way to do the math because it assumes the disconnected cells are evenly distributed among the 96 cell groups. The thing that actually matters is that the cell groups have equal Ah capacity so that they can remain balanced. A high speed probing station could actually find bad bond wires pretty quickly.I’m guessing you wouldn’t be able to notice until there were 2 dozen cells randomly disconnected.
22/4416 is 0.5%, it doesn’t surprise me if they let them out the door with a few disconnected.
This is the wrong way to do the math because it assumes the disconnected cells are evenly distributed among the 96 cell groups. The thing that actually matters is that the cell groups have equal Ah capacity so that they can remain balanced. A high speed probing station could actually find bad bond wires pretty quickly.
This is the wrong way to do the math because it assumes the disconnected cells are evenly distributed among the 96 cell groups. The thing that actually matters is that the cell groups have equal Ah capacity so that they can remain balanced. A high speed probing station could actually find bad bond wires pretty quickly.
You’ll note I did say “randomly disconnected” on purpose.