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BQ76952: BQ76952 BMS design with integrated functions

Star Xu
Genius 9645 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQ76200

Hi

The customer is  planning to design a BMS with integrated output function. The rough block diagram is as attached. Please help confirm whether this design can operate normally.

The requirements are as follows:

1. The battery pack is 13S with a rated output power of 6000W (AFE decided to use bq76952)

2. Add a set of integrated MOS controls, tentatively using bq76200

3. PM+ is the positive terminal of the secondary battery pack

1, Is the attached block diagram feasible?

2, Is the control MOS direction of the package reasonable?

3, When the main battery pack MOS (Q1, Q2) are all turned off, can the secondary battery pack MOS (Q3) be turned on normally?

4, If this solution is feasible, how to deal with the BAT and PACK pins of bq76200, and which channel Q3 uses to drive

5,  When switching, prepare to turn off the main battery pack Q1 → turn on Q3 → output the secondary battery pack. Is this logic reasonable?

Waiting for your reply.

Thanks

Star

  • 0
    TI__Mastermind 25850 points

    Hi Star,

    This looks reasonable, although you likely will want a second FET back-to-back with Q3 so that you can control when the backup battery both charges and discharges.

    Rather than using the bq76200 and discrete FETs for the backup battery, I recommend taking a look at TI's portfolio of high-side switches; they will likely provide a more robust solution compared to using the bq76200.

    The switching logic sounds reasonable.

    Regards,

    Max Verboncoeur