Hello Everybody,
I am designing a new DC-UPS with external batteries, and I'd like to keep track of their SOC. Some of those batteries (LiFePO4, LiCoO2) will have a BMS with integrated bq40z50 (IT + NFET HiSide control + Led display) or bq3060 (CEDV + PFET HiSide Control, but no Led display alas). The Central Unit can thus retrieve info from the batteries via SBS.
But the system MUST also run on third party batteries without SBS info, such as 12V / 12Ah SLA (no connection to internal cells), or Li-Ion/LiFe batteries with integrated protection but no SBS.
I'd like to implement a (rough) gas gauge inside the unit - a basic Coulomb Counter - controlled by a MCU, and user program it according to the chemistry / capacity of the external batteries. No connection to the external battery cells, no cell balancing, no current/voltage monitor or whatever.
I saw that bq34z110 supports Lead Acid chemistry. But does it support also other chemistries like Li-Ion or Li-Fe?
Bq2060A is multichemistry, but is intended for pack integration (and needs an EEPROM along)...
Do I rather have to go for the bq26200 / bq26220 / bq26221 / bq26231 / bq26500 / bq26501 series, and scale the voltage/current as if it were a single cell battery?
If anyone has an opinion or suggestion, I'll be glad to read it.
Thank you.
Best Regards.
Matthieu.