I think I get the idea that you can bleed off excess energy of individual cells when charging has concluded.
What I’m struggling with is the concept that MG has found a (low cost) way to discharge high voltage cells while simultaneously topping up the rest in order to achieve equilibrium??
The problem is, these bleed down resistor are such a low value that levels like 2milliamp discharging is about the max.
These resistors turn on when a cell goes high voltage, but 4/5ths of FA reduction in charge current to the high cell resulting in the high cell going even higher till something trips the cell over voltage stop charge.
From that point, the low cell remains low and the capacity from the high cell/s is wasted as heat and this will require cooling, wasting more energy from all the cells if the charger doesn't supply it.
Each repeat balancing operation will get the low cell higher, until eventually (it is hoped) the full pack end of voltage occurs before a cell goes over voltage and stops the charge.
From that point on, every charge to 100% will get the battery closer to fully balanced
We live in hope that a BMS manufacturer will build an active balancing unit that manufacturers will adopt and save all this nonsense and rectify the declining battery health problem ......
At the moment, about the best solution available is 7 x 16 cell units to allow an overlap between the units to move a high cell voltage progressively through the units to reach a low cell that is out of range of the single 16 cell active balancer unit.
Another company, Deligreen
Li-ion Battery Equalizer Balancer have individual cell balancers that connect together in a chain to move the capacity from the high cell to the low cell
T1 Terry
