• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 64 subscribers
  • Views 336 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.

BQ35100: EOS for BQ35100

Christina Lim
Expert 5975 points
Part Number: BQ35100

Hi,

I'm currently trying to use BQ35100 with Li-SOCl2  and had some questions. Based my battery chemistry.

  1. Is it better to use normal coulomb counter to measure battery state of health instead of BQ35100 if I'm not using in EOS mode?
  2. Is there battery characterization need to be done for BQ35100 for EOS mode to work?
  3. Do I need to update it’s impedance value or it will do calculation by it’s own?
  4. It's mentioned that for optimal accuracy, the first eventnwhere the device updates it's impedance value is required to be when battery is full. If the battery was partically discharge, then the accuracy of the EOS detection is compromised. In this case, how does BQ35100 compensate the passivation of the battery?

Thanks,

Christina

  • 0
    TI__Guru* 76230 points
    Hi Christina,
    1.yes, i would recommend coulomb counting for the cell type if eos isn't used.
    2. if you are using just EOS, then no, no charachtersiation is needed as the gauge uses just the rate of change of the r cell.
    3 No you do not, the gauge does that for you when you program the chem id and update your design capacity.
    4. passivation is taken into the into the account by the algorithm. see section 5.3.1 of the document below:
    www.ti.com/.../sluubh1c.pdf

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    TI__Expert 5975 points

    Hi Onyx, 

    1. It will be good if you can recommend us some coulomb counter.
    2. May I know how it measures the RNEW, is there anything we need to do on the hardware before sending new_battery() command?
    3. Regarding the passivation, the IC will delay the resistance measurement for certain period of time so that we can do de-passivation on the battery first?
    4. On TI reference, how do you implement this delay and de-passivation?

    Thanks,

    Christina 

  • 0 in reply to Christina Lim
    TI__Guru* 76230 points
    Hi
    -the bq35100 is a good coulomb counter. THe gauge has three modes of operation of which coulomb count ( accumulator mode) is one
    - Pls see the TRM, the flow diagram is there on how the device should be used.
    -Yes.
    - The gauge doesn't do it. the first few discharge pulses depassivates, so the gauge knows to not start taking eos measurements with the first set of pulese

    thanks
    Onyx