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BQ34Z100-G1: BMS application for 15 series Li-Ion battery

Kay Chen53
Expert 2225 points
Part Number: BQ34Z100-G1

Hi there:

I'd like to check about application for the bq34z100-g1, the currently design of EVM is 48V max.

Our customer would like to use it as 15 series cell, which voltage is up to 63V(15*4.2V) for Pack. 

May I  know how to set-up the parameter on EVM or any public reference design could share for this case?  

  • 0
    Expert 2475 points

    Most of the external components should be okay, but you should check VDS on Q4 when the FET is off. The FET is only rated at 50V, so it may need to be replaced. You may also run into a power dissipation issue with Q3 and Q8, especially if you use the LEDs. And you will need to update one of the resistors in the R1/R26/R27 voltage divider to update the BAT sense threshold. The formulae are in the datasheet. The data flash updates will follow the same guidelines as when using a lower voltage stack, but the Number of Series cells will be set to 15.