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BQ34Z100-G1: Trying to "repair" incorrect settings from BMS vendor

Michael Rausch
Prodigy 10 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: GPCCHEM, BQ34Z100

Dear all,

when analyzing a BMS which does not perform as expected in the field (I do have 51 installations/devices using this particular BMS), I ran across strange figures.
The battery pack consists of 3.2V 100Ah LiFePO4 pouch cells in 16S topology.

The fuel gauge however reads:  chem id 0x0107:  (LiCoO2/carbon)    instead of 0x4xxx for LiFePO4

Some of the parameters read, just as default values for Li ion, the only things changed seem to be number of cells in series and some pack configuration.
(trying to attached full .gg.csv in next post)

* Field Order: Class name Subclass name Parameter name Parameter Value Display Units
Configuration Data Design Capacity 10000 MilliAmpHour
Configuration Data Design Energy 5400 MilliWattHour
Configuration Data SOH Load I -400 MilliAmp
Configuration Data Cell Charge Voltage T1-T2 4200 mV
Configuration Data Cell Charge Voltage T2-T3 4200 mV
Configuration Data Cell Charge Voltage T3-T4 4100 mV
Configuration Data Charge Current T1-T2 10 Percent
Configuration Data Charge Current T2-T3 50 Percent
Configuration Data Charge Current T3-T4 30 Percent
Configuration Data Device Chemistry LION -
Configuration Discharge SOC1 Set Threshold 150 mAh
Configuration Discharge SOC1 Clear Threshold 175 mAh
Configuration Discharge SOCF Set Threshold 75 mAh
Configuration Discharge SOCF Clear Threshold 100 mAh
Configuration Discharge Cell BL Set Volt Threshold 2800 mVolt
Configuration Discharge Cell BL Set Volt Time 2 Seconds
Configuration Discharge Cell BL Clear Volt Threshold 2900 mVolt
Configuration Discharge Cell BH Set Volt Threshold 4300 mVolt
Configuration Discharge Cell BH Volt Time 2 Seconds
Configuration Discharge Cell BH Clear Volt Threshold 4200 mVolt
Configuration Registers Pack Configuration 09d8 flags
Configuration Registers Pack Configuration B af flags
Configuration Registers Pack Configuration C 37

flags

What would you suggest? Changing the chemid to (any) 0x4xx (measuring and matching chemid is a bit tricky in the setup) and amend the other parameters values to something reasonable?

Thanks a lot for your ideas,
Michael

  • 0
    TI__Genius 12215 points

    Hi, Michael

        I think to find a best match chem ID is always needed in the first place, you can find the cloud tool and its guidance by searching with keyword "GPCCHEM", then you need to download the chem ID data to the device change the parameters like charging voltage, taper current as well as terminate voltage to the appropriate value per the battery characteristics and application requirements. 

       Then you need to do a learning cycle with the modified value and updated chem ID and then download the learned results to the target device for test.

       But in general, for the LiFePO4 battery, the gauge with CEDV algorithm is better than bq34z100 as it is less sensitive to the flatness of the OCV-SOC curve