Here's a Circuit to think about .........
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Here's a Circuit to think about .........
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View attachment 311358
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Thanks LowQCab.
Currently look at this.

 

Can you please explain how this works? Thanks.

 

That's a passive balancer as often found in many lithium chargers and cheap Chinese BMS

@Khaleef An active balancer, much as you initially described, where energy is absorbed from the faster charging cells to augment the charging of slower cells is perfectly do-able and there are dedicated chips for this purpose, as used in many EV applications where passive balancing would generate too much heat.. Read this article from Analog Devices and look at the data-sheets for LT8584 and LTC3300-2. Other manufacturers have similar devices



My own experimental charger avoids balancing by having 8 isolated secondary windings on a line-driven flyback SMPS, each providing 3.6v @ 30A via a per-cell linear CV/CC charge circuit to individual cells in the stack.

 

It's 100% Linear-Regulators, and must have a huge Fan-Cooled Heat-Sink.

There is a "Shunt-Regulator" situated around each Battery Cell that limits the max-Voltage per Cell,
and a single Linear-Current-Limiter for the entire Circuit.

It draws the Maximum-Regulated-Current at all times when Powered,
but, no Power other than Battery-Voltage is required for "Discharge-Mode".

A Pot is provided for setting the Charge-Current to any desired level below the max.

There are no individual "Charge-Level" Indicators, but they could easily be added.

All Cells are "forced" to either the Fully-Charged-Voltage,
or to the lower, preset, "Storage" Voltage.
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