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Original question:

BQ2970: Parallel Battery Pack Usage

BQ2970: Protection for 5 cells in parallel

Danilo A.
Mastermind 24715 points
Part Number: BQ2970

Hi Team,

We received a similar inquiry to the other thread but the customer will use 5 cells in parallel instead of 4. As I understand, 1pc. BQ2970 can protect 1 cell and 5pcs. can protect 5 cells. How is the configuration of the 5pcs. BQ2970? Should he connect the BQ2970 and cells as shown in the schematic diagram at page 1 of the datasheet then connect the Pack+ of the 5pcs. BQ2970 together then same with the Pack-?

Regards,

Danilo

  • 0
    TI__Guru* 77353 points

    Hi Danilo,

    I assume you mean there will be 5 cells in parallel within one battery pack? In this case, the 5 cells will be shorted together and will behave as one higher capacity cell. They will interface to the BQ2970 just as you do with one cell in the datasheet image.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    TI__Mastermind 24715 points

    Hi Matt,

    Our customer would like to add individual protection devices to each battery. Will there an issue if he will connect one BQ2970 to one battery (total of 5pcs. BQ2970 and 5pcs. batteries) and connect the 5pcs. Pack+ terminals together, the same with the 5pcs. of Pack- terminals?

    Regards,

    Danilo

  • +1 in reply to Danilo A.
    TI__Expert 3990 points

    Hi Danilo, 

    This can be done, although I haven't seen anyone do this, and I don't believe it is generally required.  I assume you will also include FETs to disconnect each individual cell, so the cost of the electronics will be higher vs using a single device and single set of FETs for the entire 5p pack.

    Thanks,

    Terry