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Gas Gauge for VRLA & BQ24450

Afonso santos
Prodigy 140 points
Other Parts Discussed in Thread: BQ24450, BQ2013H, BQ2060A, BQ2019, BQ2023

Hello,

I´m using a BQ24450 to charge a 12V/7Ah lead Acid Battery, and I whould like displaying the SOC ( State of Charge ) in %.

How can I do it, and the easiest way in order to get also voltage and current information during the charge process.

Regards

 

  • 0
    Prodigy 140 points

     

    Does anybody has an idea how to do it?

  • 0 in reply to Afonso santos
    Expert 2135 points

    The bq24450 does not provide any of this information so you'll have to use any of the standard methods for gathering it, such as microprocessor and ADCs (if not built in) with a current sense resistor and coulomb-counting firmware or a coulomb-counting chip or chip set that gathers this info and reports to your microprocessor so you can calculate SOC.

    John

  • 0 in reply to John M
    TI__Genius 14985 points

    Gas gauge solutions:

    The bq2013H is a complete gas gauge solution for lead acid batteries.  The bq2060A is another gas gauge which works for many chemistries, including lead acid.

     

    Battery monitoring solutions:

    bq2019 or bq2023 can report the voltage, current, temperature to your host processor which will then need to run its own algorithm to determine SOC and other gauging functions.  Flow charts are provided in the product folders, but this is not a trivial project and a complete gas gauging solution is recommended.

  • 0 in reply to dMax
    Prodigy 140 points

    But unfortunately, both bq2019 or bq2023 cannot operate with lead acid bateries ( seen at datasheet) .

    Any idea where to find coulomb counter ?

  • 0 in reply to Afonso santos
    TI__Genius 14985 points

    Hi Alfonso,

    The bq2019 and bq2023 are actually chemistry independent and will work fine with lead acid batteries.  The datasheet says "ideal for Li & NiMH" but they can be used for any chemistry.  They are simple battery monitors which track voltage, temperature, and count coulombs.  It is up to your host firmware to take this information and use it.  However, it is a very complex project to write your own firmware to use the information from a battery monitor to perform fuel gauging.  That is why we recommend complete gas gauge solutions like bq2060A for lead-acid.  Once you configure it for your project it will do all the calculations for you.  The configuration of a gas gauge is not trivial, either, but it is much easier than writing the firmware to do your own gas gauging solution using a battery monitor.