BQ41Z90: BQ41Z90: LTO batteries

Eduard Shuvaev

Prodigy 20 points

Part Number: BQ41Z90
Other Parts Discussed in Thread: BQSTUDIO

Hello TI team,

We’re designing an 11S3P automotive pack and evaluating the bq41z90 for gauging/monitoring. A couple of questions:

ChemID support. Our pack uses Toshiba SCiB (LTO) cells. I don’t see an SCiB/LTO ChemID under the Chemistry tab for bq41z90 in bqStudio. I know SCiB ChemIDs exist for other TI gauges. Does bq41z90 support SCiB/LTO ChemIDs and, if not, what’s the recommended ChemID to start with or the process to request one for this device?
Low-voltage operation. Are there device-level restrictions for very low per-cell voltage? In a worst-case, each cell could be fully discahrged below ~1.0 V (pack ≈10 V for 11S). Will bq41z90 remain operational and provide reliable measurements in that condition, or are there minimum cell/pack voltage limits we should observe?

Thank you!

1 month ago

0 Alan Frias 1 month ago

TI__Mastermind 30810 points

Hello,

This question has been assigned within the team and will be reviewed and followed up with the engineer when possible.

Thank you,
Alan

0 Eduard Shuvaev 1 month ago in reply to Alan Frias

Prodigy 20 points

Hello Alan,

Just checking in to see if there are any updates or insights on my questions.

Thank you!

0 Diego 1 month ago in reply to Eduard Shuvaev

TI__Mastermind 28985 points

Hi,

1) IF your chemid is not present, then it is not supported by DZT. The chemid will need to be recreated. Please contact your supporting FAE or your local ti office for help with this.

2) As long as the combined stack voltage exceeds Vstartup then you should be ok.

Regards,

Diego

0 Eduard Shuvaev 1 month ago in reply to Diego

Prodigy 20 points

Hi Diego,

Thank you for your reply. Could you please let me know who our FAE would be, or which local TI office we should contact if we are located in Charleston, SC?

0 Diego 17 days ago in reply to Eduard Shuvaev

TI__Mastermind 28985 points

Hi,

You can either reach out to the Knoxville office or the Dallas office.

Regards,

Diego

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BQ41Z90: BQ41Z90: LTO batteries