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Battery pack imbalance magnitudes

Battery pack imbalance magnitudes

Hello, I am a student in electrical engineering and looking for information on how far individual cell SOCs in a Tesla battery pack drift apart.
I.e. if you have a fully charged pack in a Model S and drive until it is at a low state of charge, how far apart will the cells or modules in the pack be?
If balancing is done actively, how big are the balancing currents?

I'll be very happy for hints on where to find definite information about this, research papers and journal articles.

Thank you very much,

Arne