• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 100 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: how to check the 4S2P pack if some cells are not connected

Steel Fang
Intellectual 290 points
Part Number: BQ40Z50-R2

Tool/software:

Dear Ti expert,

   we have a 4S2P battery pack with BQ40Z50-R2, i just want to know if this gauge IC can dectact any cell is not well coneected.

   From my understanding, the cell resistance could be different if the 2 parallel cells with only one cell connected.

   Can this gauge IC calcuate the cell resistance?

   if yes, through which SMBUS command?

   if not, any other method can catch this issue?

  • 0
    TI__Mastermind 26115 points

    Hello Steel,

    The user is able to define if there is a  resistance between series cells connection to the high current path of the PACK by using "cell x Interconnect Resistance" if they see a noticeable amount of resistance.

    The gauge is not intend to do quality assurance for a battery pack being proplery connected and typically we would recommend using a contiunity test for that purpose. However what you could do is  view the resistance of the cell is through "Cell X CompRes" which is last temperature compensated Resistance of the cell. Lastly you can view your Ra tables which would give you the resistance of the cell at different OCV points and they should be similar among each cell. Assuming that you have high quality cells but there is still alot that would effect resistance at any point that doesn't include resistance to the busbar which is why we don't recommend these procedures for testing for connection.

    Another and reliable way of checking to see if your cell is not connected well is using a heat vision gun and looking for hotspots on the busbar since higher path of resistance would create heat.

    Thank you,
    Alan