Other Parts Discussed in Thread: BQSTUDIO
Hi,
I am using the BQ28Z610 to monitor a LiFePO4 2S1P 4000mAh battery pack. I performed the learning cycle correctly as well as the a field update so the update status is set to 0x0E. After I charged the battery to full and that the Remaining Capacity and Full Charge Capacity fields update (CSYNC is set), averything looks good with a RSOC of 100% and a SOH of about 90%, which is Ok with me.
The problem is when I unplug the battery pack from the circuit and I replug it back in after a while, the BQ28Z610 has forgot what was the Full Charge and Remaining Capacity and just puts some random number going from 0mAh to the last learned Qmax. At this time, the device is sealed and ready for field used with cell balancing and everything.
EDIT: I just figured out that when I unplug-replug when the device is not sealed, I have a better approximation of what the capacity should be. It oscillates around a lower value than expected but it is way better than when the device is sealed. I use BQStudio to troubleshoot the parameters. Still, I would like to get the same (for the same temperature) Full Charge Capacity value as when I unplugged the battery pack.
Here is the flash export:
* Texas Instruments Data Flash File * File created Thu Apr 04 09:24:57 2019 * * Device Number 502 * Firmware Version a5.ff * Build Number 0 * Order Number 0 * * bqz Device Number 2610 * bqz Firmware Version 0.20 * bqz Build Number 25 * * Field Order: Class name, Subclass name, Parameter name, Parameter Value, Display Units "Calibration","Voltage","Cell Gain","12150","-" "Calibration","Voltage","Pack Gain","49328","-" "Calibration","Voltage","BAT Gain","49073","-" "Calibration","Current","CC Gain","39.813","mOhm" "Calibration","Current","Capacity Gain","39.825","mOhm" "Calibration","Current Offset","CC Offset","0","-" "Calibration","Current Offset","Coulomb Counter Offset Samples","64","-" "Calibration","Current Offset","Board Offset","0","-" "Calibration","Current Offset","CC Auto Config","07","hex" "Calibration","Current Offset","CC Auto Offset","64","-" "Calibration","Temperature","Internal Temp Offset","0","°C" "Calibration","Temperature","External1 Temp Offset","0","°C" 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R_a 5","23","2^-10ohm" "Ra Table","R_a1x","xCell1 R_a 6","21","2^-10ohm" "Ra Table","R_a1x","xCell1 R_a 7","32","2^-10ohm" "Ra Table","R_a1x","xCell1 R_a 8","35","2^-10ohm" "Ra Table","R_a1x","xCell1 R_a 9","34","2^-10ohm" "Ra Table","R_a1x","xCell1 R_a 10","36","2^-10ohm" "Ra Table","R_a1x","xCell1 R_a 11","40","2^-10ohm" "Ra Table","R_a1x","xCell1 R_a 12","43","2^-10ohm" "Ra Table","R_a1x","xCell1 R_a 13","74","2^-10ohm" "Ra Table","R_a1x","xCell1 R_a 14","790","2^-10ohm"
My application necessitates that we prepare the system for production in factory but we need to unplug the batteries for storage and transport (we can't have them physically plugged in). So after doing things right and "pairing" the battery with the fuel gauge, everything resets when we plug the battery back since the BQ28Z610 reboots from complete shutdown. Is there a way to keep taht information stored somewhere? Or at least send a command that would set the Full Charge Capacity and Remaining Capacity fields to Qmax?
Thanks,
Xavier
