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BQ76952: charge/discharge FET selection

Vincenzo Pizzolante
Mastermind 23291 points
Part Number: BQ76952

hi,

we are working on a modular BMS, 4-26S.

we will use 2x BQ76952 as for TIDA-01093 

here 6x FETs have been used for a 20Ah pack; as the biggest pack will be 200Ah, what is the most viable solution?

still FET (I believe not) or rather relays? 

thanks a lot in advance

KR

Vincenzo

  • 0
    TI__Guru 54715 points

    Hi Vincenzo,

    It really depends on the system and requirements.  Some large batteries are large because the need a long run time although they don't necessarily need a high current.  FETs may be very practical still for such a battery.  If the short circuit current is very high from the large capacity you may want the features of the BQ76952 of being able to set a short delay time and relatively low SCD threshold so that switching occurs before high current develops.   Other systems may be more like automotive systems and may use a relay, possibly even controlled by an alternate power source. Relay systems often react more slowly, potentially after a decision to stop normal operation has occurred and current has hopefully decreased through a normal control path.  Keep in mind that the BQ76952 is not an automotive design, it is designed to monitor cells and control modest FETs.  Certainly there are many creative ways it can be used.