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Original question:

BMS system solution recommendation

BQ76952: BMS system solution recommendation

Zoey Wu
Expert 5805 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQ79616

The battery pack is 63V 90AH with 21700 cells. There are 2 types for it, one is 15 cells in series and 18 cells in parallel for one battery pack unit. Another one is a big box and insert 6 battery pack unit in parallel, each battery pack unit consists of 15 cells in series and 3 cells in parallel. Communication via CAN bus protocol.

My questions is：

  1. What the different between one unit and 6 unit for balance, charge and discharge?
  2. How to deal with the communication among the 6 6 battery pack unit?
  3. Base on TI the solution and experience, which type is better? Why?
  4. Please base on above to provide the solution? If still need detail information, please let me know.
  • 0
    TI__Guru* 81034 points

    Hi Zoey,

    For balancing within one pack, the number of cells in parallel does not affect the balancing algorithm. With more cells in parallel, it will take more time to balance, but the monitor does not behave differently because the parallel cells will behave as one larger cell since they are connected together. The same is true for the charge and discharge - the total current will be higher, but the monitor will just measure the total current through the sense resistor.

    They would need to manage communication through their host controller - each monitor communicates through I2C. I do not know if one solution is better than the other. The single pack is simpler since it requires only one battery monitor.

    You may also want to look at the automotive battery monitors since they are commonly used in very large batteries (like BQ79616). I am not too familiar with this family myself.

    Best regards,

    Matt