Part Number: BQ27441-G1
I've been struggling for several weeks to solve the following problem: I'm using the bq27441G1 chip to control the charging of a 3.7V 3000mAh Li-ion battery. Once the battery is fully charged, if I discharge it with a constant current (between C/30 and C/8) down to 0%, the gauge readings are correct. However, if the discharge cycle is discontinuous, for example, a discharge at C/10 for 3 hours followed by a one-hour pause (discharge current < 1mA), the battery's state of charge (SOC) instantly drops by several percent when I restart the discharge at C/10. If I continue the discharge with one or two more discharge + pause cycles, the gauge's SOC reaches 0% even though there are still several tens of percent of charge remaining in the battery. I performed several full charge and discharges to have the device computing the QMAX and Ra tables without much success. After updates of the Ra table, the filtered SOC tends to be more accurate but only when SOC is roughly 60%, after that the filtered SOC is falling too fast to reach 0% at about the same time that the unfilterd SOC. I Join a capture of the SOC step event done with the eval board. I see that 'debugX' values have big value changes at the time of the event but I do not have any clue of what those debug values meanstep_capture.xlsx ... If someone may help ....
