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BQ40Z50: Cell open detection

Kane Wan88
Prodigy 620 points
Part Number: BQ40Z50

Hi Team,

My customer is developing a 2s2p gauge solution for VR(virtual reality) application, and I would like to know in that 2p cell, if one cell is open, can our gauge IC detect it out?

Thank you.

  • 0
    TI__Genius 12215 points

    There is no such protection for bq40z50, but if the cell connecting wire for battery monitoring is open, then the gauge will probably read wrong voltage and other faults, like over voltage or under voltage could be possibly triggered. 

  • 0 in reply to Steven Yao
    TI__Prodigy 620 points

    Hi Steven,

    If one cell is open in 2P structure, means the current of that cell will increase and voltage drop will be larger. Your gauge IC has cell balance detection (for 2S), can you do the cell balance then check if one cell is open in 2P structure?

    Kane

  • 0 in reply to Kane Wan88
    TI__Genius 12215 points

    Hi, Kane

       Yes, the voltage difference between the 2 cells with cell connection wire broken in series will deteriorated when cell balancing started. but cell balancing can not be started by sending command, it starts automatically according the voltage or SOC variation between the cells. 

  • 0 in reply to Steven Yao
    Intellectual 320 points

    Steven

    Would you please explain this more detail to me?

    " it starts automatically according the voltage or SOC variation between the cells. "

    My understanding is if voltage change or SOC updated, gauge IC will do cell balance detection automatically, it this correct?

    Yihung

  • 0 in reply to user4134045
    TI__Genius 12215 points

    Kane

        The first time balancing will be started when a valid DOD update has occurred, then afterward, The gauge will attempt to recalculate the cell balancing time in RELAX mode every Relax Balance Interval.