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BQ78350-R1: CEDV learning cycle current rates

pebl97
Intellectual 290 points

Part Number: BQ78350-R1
Other Parts Discussed in Thread: GPCCEDV

Hello guys,

the project is to obtain the optimal parameters for our battery profile with the CEDV method.

The requirements are:

- 7 amps (lowrate) @ 2.5°C, roomtemperature and 45°C

- 15 amps(highrate) @ 2.5°C, roomtemperature and 45°C

Battery Specs: 

- 4 cells in series 

-14 cells parallel

- 58 volts end of charge 

- 39 volts end of discharge

Now the Problem: If i test the batterypack with 15 amps the BMS switches the battery off, because the cells exceed 60 °C cell temperature. Is it a requirement to make a constant discharge with 15 amps at every temperature or can we vary the current for different temperatures. 

  • 0
    TI__Guru* 81035 points

    Hi,

    The GPCCEDV tool really should use the same current load at each temperature to calculate the optimal CEDV gauging parameters. If 15 amps will shut down the BMS due to a temperature fault, it seems like you need to use a lower value for the high load.

    Best regards,

    Matt