I am designing battery charger and I want to know how to calculate max charging current for a lithium-ion battery pack. I am using Texas Instrument Chip bq24616 and their evaluation board.

Assumption: Battery pack has- 5 in parallel and 4 in series of 18650 batteries include onboard BMS.

Base on the datasheet of the battery:

Each cell is 3.7V 2500mA

Standard Charge current 500mA

Battery pack = 14.8v 20AH

Is that mean max charging current is 5 x500mA = 2.5A

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Yes, according to KCL the charge current splits up into five equal partial currents when five cells are nearly identical and connected in a parallel manner. Therefore you should always create a battery pack consisting out of cells from the same batch.

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  • \$\begingroup\$ Yes, all are same battery. So even if you do fast charge max is #parrallel cells x recommended charge per cell \$\endgroup\$ – Shahreza Jun 26 at 19:23
  • \$\begingroup\$ There are different fast charge algorithms. In none of the possible charging modes you should exceed the maximum charge current stated in the cell data sheet. \$\endgroup\$ – Thauer Jun 26 at 19:33

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