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BQ76PL455A: for 14S4P

Sergey Zobachev
Prodigy 40 points
Part Number: BQ76PL455A

Hello, I want to use
BQ76PL455A battery 14S4P tell me this is possible, as shown below. Can I do automatic disconnection of parallel lines to charge them as serial circuits? Perhaps this is not required? 

  • 0
    TI__Genius 17370 points
    Hi Sergey,

    If I understand correctly, the bq76pl455a does not care how many parallel cells are connected. The connections to the cells in series is good enough to monitor the voltage of all the cells in the pack.

    Regards,

    Taylor
  • 0
    Prodigy 30 points

    Hello,

    please tell me how possible the next BMS design scenario is:

    we have the battery that consists of 14 elements in each line, that connected in 4 parallel (14s4p). In this battery, we use e35 Samsung 18650 cells.

    For example, I want to use BQ76PL455A for balancing each line separately, is it a good idea and realisable with BQ76PL455A in case of the separate charging process for each line (we want to increase the life of the battery). Can we realise automatically disconnection of parallels using BQ76PL455A for separate charging process for each parallel lines (like on the picture below)?

    Also, we want to design the system, that can be charging without load disconnection.

  • 0 in reply to Taylor Vogt
    Prodigy 40 points
    Hello,
    please tell me how possible the next BMS design scenario is:
    we have the battery that consists of 14 elements in each line, that connected in 4 parallel (14s4p). In this battery, we use e35 Samsung 18650 cells.

    For example, I want to use BQ76PL455A for balancing each line separately, is it a good idea and realisable with BQ76PL455A in case of the separate charging process for each line (we want to increase the life of the battery). Can we realise automatically disconnection of parallels using BQ76PL455A for separate charging process for each parallel lines (like on the picture below)?

    Also, we want to design the system, that can be charging without load disconnection.
  • 0 in reply to Sergey Zobachev
    TI__Genius 10785 points
    Hi Sergey,

    Can you explain more detail what you mean by "balancing each line separately"?
    Also "separate charging process"

    Perhaps, you can share the block diagram of your configuration.

    Roger
  • 0 in reply to Roger Hwang
    Prodigy 40 points

    Battery wiring diagram As we can see when the fuse insert burns out, the capacity of the parallel package will drop. The package in which one Bank will be less charged faster than the others. BMS will turn off the charge, but other parallel packets will be undercharged. The idea above is to reduce the impact of this package on the degree of charge of the entire battery.

  • 0 in reply to Roger Hwang
    Prodigy 40 points

    Battery wiring diagram As we can see when the fuse insert burns out, the capacity of the parallel package will drop. The package in which one Bank will be less charged faster than the others. BMS will turn off the charge, but other parallel packets will be undercharged. The idea above is to reduce the impact of this package on the degree of charge of the entire battery.

  • 0 in reply to Sergey Zobachev
    TI__Genius 10785 points

    Hi Sergey,

    I am still bit not clear but PL455A has no issues. It will monitor whether you have 1P, or 4P..

    It's up to your system design to consideration.

    Roger