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BQ34Z100-G1: BQ34Z100-G1 problem for learning cycle with NiMH 12S2P

Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQSTUDIO

12S2P_nimh.zip

  • Hello,

    I encounter a problem to finalize a learning cycle with a NiMH battery organized in 12S2P (=> 2x2000mAh).
    I followed the instructions found either on this forum and also in a few Texas documents but without success.
    I followed the following steps:

    1 / settings in bqstudio
    2 / calibrations
    3 / Complete discharge until OCVTAKEN is red
    4 / reset
    5 / launch of IT
    6 / charge

    I use a laboratory power supply, not yet having the charger.

    Here are my questions:

    -> Is it necessary to connect the NTC to the cells? As I use the EVM I would have to desolder this one to stick it on the cells.
    I will do it if it is totally indispensable.
    If not, is there something to disable?

    -> At the end of the load I see the voltage drop and my current is constant at 1A. I also see that the cummulated capacity is substantially equal to the capacity of my PACK (4000mAh) and the gauge indicates 100%.
    In order to go below the value of the tapper current (set to 100mA), I gradually lower the current limit of the power supply up to 60mA.
    And there after several hours nothing happens, FC never goes in red ... and learned status stays to 04.

    Do I discharge totally the battery again, or just a little and charge again?

    So I need help to understand what I am doing wrong in this manipulation.
    I attach the configuration file and load log.

    thanks in advance
  • For complete information:

    I use cells ARTS energy HRMT 23/43 1.2v/2000mAh and I have chosen chemistry ID 6100.
    Thank you.
  • Is it possible to have a response from someone from Texas?
  • Having received no help from Texas, which I have been soliciting for several days, I have therefore taken up the whole problem from the beginning.
    I finally succeeded my learning cycle.
    It is a pity that this forum is not more reactive.
    I will soon be posting a document dealing specifically with the NiMH topic, this technology is not end of life far away ... and the information is very lean.
    By revisiting some of the information given on this forum by Texas (for the NiMH) I have pointed out errors that have been given and that do not allow for repetitive results.
    As I am a follower of knowledge sharing I will make this document very soon.
    A very disappointed member, yet loyal to Texas products since many years ...