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BQ4050: GPC process, the CellTermV setting and its effects

user5935209
Prodigy 60 points
Part Number: BQ4050

Hi, I am doing the GPC process. However, I found that the CellTermV would affect the SOC accuracy significantly in the GPC Reports. I want to know

(1) How does the CellTermV affect the SOC accuracy?

(2) How to set a correct CellTermV, should CellTermV=EDV0? If not, will the the SOC be wrong in the real application?

  • 0
    TI__Mastermind 42535 points
    1. cell term basically for IT gauges sets a hard floor where you declare that the cell is fully discharged and has no remaining capacity. Increasing it will reduce capacity and thereby also affect RSOC shown by the gauge.
    2. EDV0 is where the CEDV algorithm determines the capacity as estimated by the gauge using the CEDV algorithm and the load factor reaches 0. Now, you can use fixed EDV0, wherein if the voltage is hit and sustained for hold time, the capacity will drop to 0, or you can allow the CEDV algorithm to determine it.

    In using GPC, I would advise you to set Term Voltage to the voltage at which your application will shut down.
  • 0 in reply to Batt
    Prodigy 60 points
    Dear Batt.
    (1) If I set the EDV0 dynamically calculated, then the accuracy at low temperature and high rate is rather low. Therefore,I fixed EDV0 and meanwhile set the EDV_CMP=1(which means the EDV1,2,0 will be dynamically calculated). In such case, will the EDV0 be fixed or not?
    (2) If I want to set the EDV0 be fixed at 3.05V, and EDV_CMP=1, will the EDV1,2 value be necessary, because EDV1,2 will be calculated anyway. If necessary, how should I set the EDV1,2 value, are they based on room temperature OCV curve?