BQ40Z50-R2: Fast QMAX update

Hello Wyatt:

Thanks for your reply.

For MaxError 101%, that means the cycle count is adjusted manually, right? But after we run a full cycle, it should recover? To what number? If it went through a QMAX update, it should be 5% or 1%(RA table updated), right?

For “a valid OCV”, the battery rest for 2 hrs after fully charged, but the QMAX didn't update after discharge. I think in the tech reference it stated 2hrs maximum for OCV measurement after charging. Is there anything I may missed?

Thanks.

Chen

Hello Wyatt:

We run some more tests on 2 of the same batteries under the conditions:

Fully charged, and rest for 2 hrs; then fully discharged, and rest for 5 hrs. Both batteries had QMAX and MaxError updated after 4 hrs rest (4:10 and 4:30). So seems like the regular QMAX is working, but not the fast QMAX. Any idea about this? Other than the FAST_QMAX_FLD, any other settings should be enable? Here are the settings:

Thanks!

Chen

Hello Chen,

If the fast Qmax in the field is enabled you should see the Qmax update if the conditions are met.

Please share the BQStudio logs from testing so we can review them along with your .gg file with the settings.

Sincerely,

Wyatt Keller