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Which BM IC should I choose?

Niclas Arndt104314
Prodigy 30 points
Other Parts Discussed in Thread: BQ20Z65

Hi,

I am trying to choose a suitable SBS 1.1 compliant design for a 4S2P or 4S3P Li-Ion pack. I have googled but been unable to find very many ready-made packs that would suit my needs. I am therefore considering developing my own PCB as a first step.

I have looked at bq20z45 / bq20z65 / bq20z75 / bq20z95 but I have a problem understanding how they relate to each other. I won't need LED or LCD monitoring, so I guess that leaves me with bq20z45 and bq20z75? Which one should I choose with regards to features, price, and market share?

Thanks in advance.

Kind regards

Niclas

 

  • 0
    TI__Intellectual 2120 points

    Hi Niclas,

       The bq20z45 would be the best choice as it is the latest solution with the most accurate Impedance Track gas gauge updates and the latest feature updates regarding charge control and protection/safety.

    Best regards

    Garry

  • 0 in reply to Garry Elder
    Prodigy 30 points

    Hi Garry, 

    Thanks!

    I have some additional questions that are a bit off-topic, if that's ok:

    Which practical and legal concerns are there regarding Li-Ion battery packs? Do I need to certify the finished battery pack with regards to selling or transportation?

    Kind regards

    Niclas

  • 0 in reply to Niclas Arndt104314
    TI__Intellectual 2120 points

    Hi Niclas,

      I'm not an expert in the area of certifications but I am sure there will some level of transportation certification requirements due to the Lithium content and then there are potentially end equipment certifications needed. These will all depend on the region of origin and end use etc... Sorry I could not be much help on this one.

    Best regards

    Garry

  • 0 in reply to Garry Elder
    Prodigy 30 points

    Hi Garry,

    Thanks nonetheless. I have another question that you might not be allowed to comment on, but I'll give it a try:

    I have googled for suppliers of complete Li-Ion battery packs with SBS 1.1 support, but I mostly come up with either cheap noname cells or simple or weak PCM modules. Could somebody please recommend a supplier, preferably in Europe? If public recommendations are against forum policy, please send it as a private message instead.

    Kind regards

    Niclas

  • 0 in reply to Niclas Arndt104314
    TI__Intellectual 1600 points

    Dear Niclas,

    I'll contact you by email in a few minutes.

    Kind Regards,

    Justo

  • 0
    Prodigy 40 points

    Hi Nick,

    I am facing the same issues that you did and was wondering how you made out in finding suppliers, and certifications.

    Any help would be greatly appreciated. - mike

     

  • 0 in reply to mike martone
    Intellectual 425 points

    Hi Mike,

    I wasn't very successful. Most suppliers in my area (Sweden, northern Europe) seemed to either sell simpler non-TI boards or want to charge a hefty amount for custom-made and -certified boards.

    To my recollection, there is a flight freight regulation that makes packs up to a certain size much "easier to deal with" than bigger ones, but it's too long ago for me to remember any details. At least it's something for you to check up on.

    You may want to look at www.fsm-elektronik.de, www.bmz-gmbh.eu, or accutronics.co.uk .

    Please note that I have not had any actual commercial contact with either of them, so I can't give any recommendation - only name some web addresses. They could be anything from brilliant to hopeless for all I know.

    I hope this will be of at least some help.

    Cheers

    Niclas