i'm trying to charge a 5Ah single cell li-ion battery using bq24090 charger controller (up to 1A fast charge current) in parallel with a current boosting circuit. Overall controller should supply fast charge current at 0.5C rate(2.5A), theoretically. Which idea does make sense if i try to charge 4 of these li-ion batteries?
option 1: using 4 distinct charger controller as described for each one of the batteries
option 2: using single more advanced charger controller such as bq24600 (up to 10A fast charge current) and supplying 4 parallel batteries from that single output of the controller.
Thank you.
datasheets
Best Answer
It's not a good idea to charge batteries in parallel, for any battery chemistry. If the batteries (cells) are in different states-of-charge, they may try to charge each other without any current-limiting between them. Better to charge them individually, so that the charger can sense each cell individually.
Cells that are permanently connected in parallel are usually assumed to all have the same state-of-charge.