Battery pack charging

I have been thinking of a design for series battery packs and the charging
of them. What I envision is custom wiring of the pack (other then its
series connection) with each cell having additional wire (positive and
negative terminals) feeding to a charge controller circuit. The charge
controller will then charge each cell independent of the pack and stop the
charge current when that cell peaks. Also for each cell in the pack, place a
reversed biased diode to limit and reverse charging to the diode drop
voltage when the pack is discharging or even when each cell gets fully
charged and the others are still charging. Has this scheme been tried or is
in use now?
All comments welcome. JTT


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