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BQ27441-G1: Battery fuel gauge that can measure SOC of individual battery from a set of series batteries

Danilo A.
Mastermind 27100 points
Part Number: BQ27441-G1
Other Parts Discussed in Thread: BQ34Z100, BQ78350

Hi Team,

We would like to ask your help regarding the customer's inquiry below

"Hi, I'm going to use a battery pack composed of 8pcs. 10 Ah LiPo cells in a series connection (the cells will process maximum current levels of up to 60 Amps in some moments). From each cell, basically, I will need to get the SOC and temperature of the cell (temperature is not mandatory but the SOC does). I'm opting for a single IC per cell since there will be some times where not all cells will process the same current levels. Is this IC suitable for that application?"

I have checked our battery fuel gauges and it seems that our product can measure the battery level of series batteries and not individual batteries. Can you please confirm if we have battery fuel gauge that can measure individual SOC of series batteries?

Regards,

Danilo

  • 0
    TI__Genius 10370 points

    Danilo,

    You are correct we do not have a device that will gauge 8 series cells on the individual level. The only gauge we have is the bq34z100 which is a top of stack gauge. You can look into our Monitor family of devices which support higher cell count. We have a monitor which works together with a companion gauge (bq78350). 

    Hope this clarifies although I am not sure it is the answer you wanted. 

    Thanks,

    Eric Vos 

  • 0 in reply to Vos
    TI__Mastermind 27100 points

    Hi Eric,

    Thank you very much for the confirmation and for you suggestions.

    Regards,

    Danilo

  • 0 in reply to Danilo A.
    TI__Mastermind 27100 points

    Hi Eric,

    I just received a follow up inquiry from the customer. According to the customer,

    My question is if it is possible to get the SOC and other variables of each cell implementing the scheme that is shown in the attached figure. The system I have in mind works in this way:
    First, the current and voltage of each cell are sensed using the BQ27Z561ImpedanceTrack Battery Gas Gauge. After getting the data, and in order to not get reference issues, an I2C-isolator IC is used. Then an I2C-multiplexer is used to receive the signals from each I2C-isolator and manage its data. Finally, the data is processed by the master IC which is connected to the output of the I2C-multiplexer.
    Regards,
    Danilo
  • 0 in reply to Danilo A.
    TI__Genius 10370 points

    Danilo,

    This is possible to do. As long as you isolate the I2C lines and give a clean 3.3V max. 

    Thanks,

    Eric Vos

  • 0 in reply to Vos
    TI__Mastermind 27100 points

    Hi Eric,

    Thank you very much for the confirmation.

    Regards,

    Danilo