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Resistance temperature compensation optimizer

J.C Chen
Expert 1285 points

Hi, guys

  When do the resistance temperature compensation, discharging is required. Discharging the battery at system typical high rate. Here i want to confirm whether the discharge rate is 0.2C. 

Or can I use the possible max continuous discharging current, like 1C?

Best regards 

J.C Chen

  • 0
    TI__Intellectual 1840 points
    Hi,

    By typical high load, I would suggest anywhere between C/4 to C/2.

    Hope this helps,
  • 0 in reply to Nabil M
    Expert 1285 points
    Hi, Nabil
    Would you like to explain the difference when i use 1C or C/2 ?
    Best Regards
    J.C Chen
  • 0 in reply to J.C Chen
    TI__Intellectual 1840 points

    Hi, 

    If you had a battery for example rated at 1600mA, and you wanted to discharge it at 1C, this means you want to discharge 1600mA out of it.

    If you want to discharge it at C/2, this would mean discharging it at 1600/2 = 800mA. 

    Hope this helps, 

  • 0 in reply to Nabil M
    Expert 1285 points
    Hi, Nabil

    Sorry to confuse you. I want to know the different effect in temperature compesation when i apply the different load.
  • 0 in reply to J.C Chen
    TI__Intellectual 1840 points

    Hi J.C Chen, 

    We're more concerned about compensating for the device's temperature (not just the cell) as there will be heat exchange between them. For example, you can be in room temperature with your device, but due to constant typical use, the device may heat up and distribute this heat to the cell through heat exchange and thus result in inaccurate gauging. 

    So the load current you must apply should be the typical current consumption of the device, for example a cell-phone may have an average draw of 100mA under constant use or typical-high use, or for example a motor draws a typical amount of 1A. The load applied should be a typical amount under normal-use; not too high, but not too low either as if the device was in shutdown or standby. 

    If you don't have the device built or ready, you can just use a "thermal box,", which is explained more in the following PDF www.ti.com/.../sluubd0.pdf

    I hope this helps,