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Parameters accuracy requirement in GPC tool calculation

J.C Chen
Expert 1285 points
Other Parts Discussed in Thread: BQ27541

Hi, All

In GPC tool calculation, there are some files required. I use the EVM (bq27541) to log data. There are some data to log, But there is no clear requirement in GPC implementation guide.

1) For room temperature

What is the range of room temperature? 25degC, 20 degC, or others? Another the room temperature may varies as time goes, will it affect the reslult(ID selection, GG)?

2) Voltage measurement

The fresh cell is connected to EVM (bq27541) with wire. There is some impedance of the wire. So when discharge the cell, there may be 5 - 10mV total lost. Will that affect the ID selection? And same to ra table?

3) System typical high discharge rate

May i use the 0.2C discharge rate as the system typical high rate(traditional optimization cycle)?

Best regards

J.C Chen

  • 0
    TI__Expert 4450 points

    Hi J.C,

    1. If there is no instruction of room temperature in GPC documents, you could choose 25 degC; meantime, during the discharge or charge of battery, it must be self-discharge, but that is not we could control. The battery model has considered this.

    2. Before you discharge you battery, first to calibrate it. If it is hard to eliminate, you could calculate the SOC accuracy of discharge process to judge the voltage's influence.

    3. About the high rate,  don't make it very large, you could determine the low rate, and 2X of low rate as high rate.

    Best regards,

    Sammi