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PassedCharge and FullChargeCapacity

Benn
Prodigy 170 points
Other Parts Discussed in Thread: BQ27541

Dear all

I use bq27541 to manage my battery pack. But I am so confuse with the relationship between PassedCharge and FullChargeCapacity (my question is described in the attachment). I hope somebody can help me.

 

Best regard

Benn

Full charge capacity.doc
  • 0
    TI__Genius 14985 points

    Full Charge Capacity (FCC) and Remaining Capacity (RM) are both compensated values which depend on the rate, temperature, and impedance of the battery.  This is different from Full Available Capacity (FAC) and NomAvailCap (NAC) which assume nominal temperature and a very light load.  If at rest, FCC and RM will usually be calculated by the gauge by running a simulation at the current temperature assuming a load equivalent to Avg I/P Last Run (in dataflash).

    The short answer to your question is that 1472mAh may have passed to get from full to empty, but at the current temperature and assuming a load of -1131mW (your Avg P Last Run value) there is 1310mAh of USABLE capacity in the fully charged battery.  Remember that the charging process is not 100% efficient, and the discharging is also not.

  • 0 in reply to dMax
    Prodigy 170 points

    I see, thanks dMax. But the design capacity of this battery pack is 1500mAh, higher than FCC and Qmax. How could I improve FCC to get more closer to 1500mAh?