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[bq27541] difference between Design Capacity and Full Available Capacity

Chang-woo YANG
Expert 1285 points
Other Parts Discussed in Thread: BQ27541, BQ27541-G1

1007.BQ27541-G1_Battery_Log_2131122.xlsx

Hello~

I have several questions for bq27541-G1.

I've checked the LOG file through the GaugeStudio Tool.

Attached is Full LOG file.

1. According to LOG file, "Design Capacity" and "Full Available Capacity" is not the same.  Is this normal?  And so or not, I would like to know why.

2. "State of Charge" value is ​​changed from 86% to 100% (3337 rows, Y columns of 1-1G sheet) or from 90% to 100% (3445 rows, X columns of 2-1G sheet).  This also would like to know why.

3. From attached Full LOG file, would you please examine whether there is the weird part??

Thanks... C.W. :)

  • 0
    Intellectual 630 points

    1.Yes design capacity and full available charge capacity are different.Full Available capacity indicates the charge that is available from the pack which depends on the temperature and the load current, basically it is the practical actual capacity available. While design capacity may be considered as theoretical capacity , i.e. what the capacity should be according to the datasheet or the data entered by you.Full available capacity changes with cell ageing and different load currents.

    2.If you see your log files SOC changes to 100% when FC bit is set in flag. The gauge uses the point where FC bit is set as the 100% capacity of pack. This is perfectly correct.