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BQ27750: Complete standalone I2C fuel gauge for single li-ion cell (PACK)

Daniel Siroky72
Prodigy 55 points

Part Number: BQ27750

Hello TI team,

we currently work on a new design of an industrial powerbank (PB) with fuel gauge with following configuration:

4x 18650 Li-Ion cell in parallel  (SAMSUNG, 3.6V, charge 4.2V nom,, 3350mAh/cell) >> total capacity 13.400 mAh

The PB should be w/o MCU. Therefore we are looking for: 

- a completely standalone fuel gauge that stores all the data about the cell - I guess some kind of NVRAM - so it minimizes the need for MCU initialization when you wanna read it out (MCU is situated outside the pack)

- fuel gauge that can calculate remaining time (time to full, time to empty) based on a current charging/discharging rate

- logs cell aging


Idea is to have a battery pack with integrated standalone charger (PB) with I2C fuel gauge that you can read out externally (when docked)  - MCU is on the docking station w/ graphic LCD => serves for analyzing powerbank state/condition.

Would you have a recommendation for the TI part? I used your selector and BQ27750 may be used but I prefer your advice. Can BQ27750 fulfill all our requested parameters? Does it contain internal NVRAM like BQ27411?

Thank you in advance.

With kind regards,

Daniel

  • 0
    TI__Guru* 76230 points
    Hi Daniel,
    Yes, bq27750 is a good choice and way better than the bq27411 in that it has flash (non-volatile memory) that can be programmed multiple times instead of OTP for the bq27411. You can choose your specifc chem id for the cell using our gpcchem tool and then program it on the gauge for higher accuracy.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 55 points
    Hi Onyx,

    excellent, many thanks for the quick reply and the recommendation.
    Regarding golden image - to do the proper characterization of the cell, can I use BQ27GDK000EVM: Gauge Development Kit (GDK). Is it compatible with EVM kit: BQ27750EVM-837? I want to use those tools to minimaze the development time (and to have as accurate golden image as possible).

    Thank you.
    BR,
    Daniel
  • 0 in reply to Daniel Siroky72
    TI__Guru* 76230 points
    Hi Daniel,
    It is a single cell gauge and should be compatible with the GDK- GDK only works with our single cell gauges. However, even if it is not, you can easily manually do the learning cycle using an electronic load and power supply as a charger.

    thanks
    Onyx