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BQ34Z100-G1: BQ34Z100G1 Storage Error

Faruk Sözüer
Intellectual 600 points
Part Number: BQ34Z100-G1

Hello to everyone

We have done BMS application with BQ34z100g1 integration. Everything was fine, but in a 1-week idle battery, the voltage dropped to 21V, while SOC showed 100%. Can this cause it?

Sincelery

Faruk Sözüer

  • 0
    TI__Mastermind 24870 points
    What is the stack voltage for your application?
  • 0 in reply to Kang Kang
    Intellectual 600 points

    The battery I use is 6S. 

    Cell Min Voltage = 2.7V (16.2V)
    Cell Max Voltage = 4.2V (25.2V)

    Dsg Current Threshold = 400mA but the idle current of the system is 300mA. Should I correct this?

    The BMS circuit draws 7mA current when idle. But we cannot see this current through BMS. Therefore, the voltage is falling in 1 week, but the BMS does not reflect this to SOC. Is there a way to prevent this? In fact, we need to automatically lower SOC in a 1 week idle BMS.

  • 0 in reply to Faruk Sözüer
    TI__Mastermind 24870 points
    Yes, can you lower the Dsg Current Threshold from 400 mA to 200 mA. We should be coulomb counting in this mode.
  • 0 in reply to Kang Kang
    Intellectual 600 points

    This side of the problem is solved this way. But we still can not prevent the voltage drop because we do not know the power spent in idle. For example, our BMS card consumes a total of 10mA power. This means 10mA/h capacity consumption in 1 hour. The capacity consumption is 240mA/h in 1 day and 1680mA/h in 1 week. But because we cannot see this consumption through the BMS, the voltage drops but the SOC remains at 100%. Does this make sense to send an IT_ENABLE command every time I use BMS to prevent this?

  • 0 in reply to Faruk Sözüer
    TI__Mastermind 24870 points
    Hello Faruk,

    You could potentially see the RSOC correction because after sending IT Enable command the gas gauge will re-calculate RSOC.

    However, you can also send a "SOFT_RESET" command which will trigger the recalculation as well.

    Make sure there is no to minimal current flowing.
  • 0 in reply to Kang Kang
    Intellectual 600 points

    Hello Kang;

    The data memory is sealed after the SOFT_RESET command. The time taken to make the data memory unseal a bit much for us. therefore we intend to continue with IT_ENABLE. Thank you very much for your support.