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BQ34Z100-G1: Application for battery voltage higher than 600V

chentsu chung
Mastermind 6180 points
Part Number: BQ34Z100-G1

Hi Team,

1. BQ34Z100-G1 could be set for 16 cells, or for only 1 cell, but can I use many cells(100 cells) as 1 cell for BQ34Z100-G1 (for BQ34Z100-G1 is only 1 cell)?If 

Does TI recommend this?

2. For battery voltage higher than 600V, does this way TI recommend?

3. If using resistor divider to scale down to the voltage equal to 1 cell (ex. 600V to 4.2V), does TI recommend?

4. Or TI recommend other way for this application?

Thank very much,

C.T.

  • 0
    TI__Mastermind 42535 points
    1. Yes, but you need to figure out balancing them.
    2. No.
    3. No, the range is far too high.
    4. Sorry, you need to look at monitors and other solutions. Gauges aren't going to be helpful here.
  • 0 in reply to Batt
    Mastermind 6180 points

    Hi Batt,

    Thank s for your help, but here I still got some question.

    For the previous question 1, you mean I can use 100 cells as 1 cell for BQ34Z100-G1, but at question 3 you say the voltage range is far too high.

    Is this mean BQ34Z100-G1 is available for 100cell (4.2V x 100=420V) but 600V? If not, then what do you mean in the answer of Q1 and Q3?

    May I clarify my question again?

    a) Now we have a multi-cell's gauge request (total battery voltage up to 600V), due to BQ34Z100-Q1 can only support to 65V, so we want to know if we can scale down the voltage to 1 cell's scale for this application.

    b) If not, then how many cell could use this way, maybe only can up to 15 cells?

    c) What is the consideration?  6V voltage drop on 600V cells reflect to 4.2V is only 1%, so it is hard to do gauge?

    Please help on this case, thank you,

    C.T.

  • 0 in reply to chentsu chung
    TI__Mastermind 42535 points

    At up to a 100V or 120V or so, we can use scaling and the voltage divider to reduce the voltage and sample it as 1 cell. However, the range shrink given that only 65535 steps are there in the divider will reduce accuracy and the resistances measured in the Ra table.

    Upto 15 cells is ideally doable without scaling.

    Yes, you will find it difficult to have accurate gauging at such high voltages because of using scaled values.

  • 0 in reply to Batt
    Mastermind 6180 points

    Hi Batt,

    Understand, it's very clear, thank you so much!

    Best regards,

    C.T.