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bq20z45-R1: Details on Calibration process, equipment required, BQMTester, etc. ?

Mohan Gurunathan
Intellectual 500 points
Part Number: BQ20Z45-R1
Other Parts Discussed in Thread: BQMTESTER, EV2400

Hello,

I am working with a Battery pack vendor who is starting up a new production flow for a custom battery pack we designed, using the bq20z45-R1.

We’re puzzled about the Calibration process for this fuel gauge.  The TI literature suggests that you need to provide an external,
accurate voltage source and current source to calibrate each gauge.  I don’t understand how to do this process.  Looking around the TI
website, there are some oblique references to tools called “BQTester” and “BQMTester.”  There’s also an “Advanced BQM Tester”.

Is it required to have one of these tools in order to properly calibrate custom battery packs on a production line?

Please let me know, if you can point me to how the typical calibration process works at a battery pack vendor, and what equipment is needed,
it would be really helpful.

Thanks,

Mohan

  • 0
    TI__Genius 14985 points
    For initial evaluation you can easily perform calibration using the bq20z45-R1 EVSW (evaluation software), and EV2300 or EV2400, and some bench equipment (power supply, electronic load, voltage and current meters). Just follow the instructions in the bq20z45EVM user's guide in section 9.
    www.ti.com/.../sluu329c.pdf

    bqMtester is an option to help you automate production of multiple packs, or you can create your own production solution or buy third party tools.

    Details about production flows and low-level calibration details are in SLUA391 and SLUA335.
  • 0 in reply to dMax
    Intellectual 500 points

    Hi dmax,

    Thank you for the answer, this is what I needed.  Appreciate the help.