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BQ27220/BQ27320 - batteries with different capacity

JAP
Intellectual 2410 points
Other Parts Discussed in Thread: BQ27320, BQ27220

Dear Experts,

I have a question regarding BQ27x20 usage on host side. When gauge locates on host side, it is possible that gauge will be paired with several different battery packs with different capacity, etc.. It is also possible that battery is charged in external charging dock, meaning that gauge is not connected to battery during charging. How does BQ27x20 perform in a use case where multiple different batteries are used and also charged apart from system?

Both variants of BQ27x20 have several CEDV-profiles. Is profile selected automatically when battery is connected to gauge or is profile always selected by the host?

If BQ27x20 is connected with completely unknown battery with unknown capacity, remaining charge, etc., can you say how long it takes for BQ27x20 to learn the battery?

Rgds,

Juha Pesonen

  • 0
    TI__Mastermind 27095 points
    Hi Juha,

    1. It is possible to have multiple batteries. BQ27320 is a flashed based gauge with 4 different battery profiles which can be updated by the user. BQ27220 is a rom based gauge with 3 pre-determined battery profiles. However, there is only one Design Capacity setting so if you do plan to use multiple batteries, it is advisable to use batteries of similar capacities.

    2. The CEDV profile will need to be selected by the host.

    3. The gauge will take an initial OCV reading when the battery is inserted in order to determine the state of charge. Updating full charge capacity will require a qualified discharge with the gauge attached to the battery. see section 1.1.3 of BQ27320 TRM:www.ti.com/.../sluube6.pdf and section 1.1.3 of BQ27220 TRM:www.ti.com/.../sluubd4.pdf

    Best Regards,
    Ben Lough