• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 62 subscribers
  • Views 835 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76930: A Battery management system to support 6S lithium polymer

JPAlleyne
Expert 1565 points
Part Number: BQ76930
Other Parts Discussed in Thread: BQ78350, BQ78350-R1

Hi,

Can this AFE/ gauge (bq76930 and bq73850) support Lithium Polymer Chemistry. If not, does TI provide any battery monitoring/ protection/ gauging system that supports a LiPo 6S configuration?

Thank you,

JP

  • 0
    TI__Guru 54715 points

    Hi JP,

    Yes, see the application note bq769x0 BMS Configurations for Cordless Appliances figure 3 for an example with 6 cells. Of course the data sheets, other ap  notes and the related TI Designs may also be helpful.

  • 0 in reply to WM5295
    Expert 1565 points
    Thank you for the quick response. Yes, I was able to go through that app note. And that 6S part helped me with my design. I guess I was a little unsure if it specifically supported LiPo, due to the fact that the ICs were categorized by chemistry and I would see some that would say Lithium Polymer and some would not. The bq76930 was one of the ICs I saw that didn't specifically say it supported lithium polymer.
  • 0 in reply to JPAlleyne
    TI__Guru 54715 points
    Hi JP,
    Yes, LiPo appears to have different meanings depending on the author, often referring more to the shape more than the chemistry. The bq76930 will support UV thresholds down to about 1.6V and OV thresholds down to about 3.1V which are often suitable for LiFePO4 systems. With 6 cells note that the minimum recommended VBAT voltage is 6V, so discharge would need to be limited to ~ 2V per cell with 6S or 3 cells per group. The bq78350-R1 gauge is CEDV so it should handle the voltage well. The bq78350 can be loaded with a variety of chemistry files, these are used for capacity estimation at reset.
  • 0 in reply to WM5295
    Expert 1565 points
    Our 6s battery pack will have a UV limitof 3V and a OV limit of 4.25V. the pack voltage is nominal 22.2V (3.7V per cell nominal). So it looks like it should support it. Correct me if I'm wrong, and thank you for your help.