• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 240 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

BQ40Z50-R2: SOH evaluation

Akshat Mehra
Prodigy 90 points
Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50

I am using Panasonic 14650R cells for which learning cycle has been executed successfully and we have the golden image flashed into the chip. 

Just want to know on how to evaluate the SOH for the above cells, like what experimentation needs to be performed to characterize the SOH using BMIC etc.?

Thanks,
Akshat 

  • 0
    TI__Guru 57697 points

    Hello Akshat,

    Do you get 100% SOH at the end of the learning and accuracy cycles. The bq40z50 will automatically track SOH, there is no additional characterization required.

  • 0 in reply to Shirish
    Prodigy 90 points

    Hi Shirish

    I get around 96% SOH which I guess is good enough. 

    The thing that I am concerned about is that I would like to have a graph which shows me SOH% vs Number of charge/discharge cycles or age of the cells.

    I will need to take a decision that at what SOH%, one need to discard the battery pack i.e. it is unusable.

    Let me know about your thoughts on this.

    Thanks,

    Akshat

  • 0 in reply to Akshat Mehra
    TI__Guru 57697 points

    Hello Akshat,

    The SOH drop depends on many factors, not just the number of cycles or age of cell. As far as i know SOH below 80% is the point at which the battery starts to degrade faster and is usually replaced. With new batteries, a learning cycle should give you 100% SOH, otherwise you may be discarding the battery much sooner. Check if Design capacity , qmax are correctly programmed and that you are charging to the correct level, otherwise adjust design capacity to compensate.