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Original question:

BQ77915: Please could someone check my circuit for 12S LiFePO4 cells?

BQ77915: 20s BMS schematic validation

Jakub Tomeš
Prodigy 20 points
Part Number: BQ77915

Tool/software:

Hello, would it be possible to validate my 20s BMS design. The design is based on the reference schematics in the datasheet and the evaluation board. It is my first BMS design, so I would like some feedback and validation. The two unconnected thermistors in the schematic will be external, routed to a connector. SCH_Dumb-a-dozen_2024-06-13.pdf

  • 0
    TI__Expert 4320 points

    Hello,

    The first thing I notice is that your RC filters have a different resistor and capacitor value than the data sheet (resistor 33Ω and capacitor 1μF). If you choose to use different values the cell voltage may not be as accurate, this is something you would to evaluate on your system yourself. For more information on stacking the BQ77915 you can refer to the Stacking Implementations with bq77915 (Rev. A) application not. This application note has a schematic that can help with your design.

    Best regards,

    Thomas Rainey