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BQ40Z60: Higher LiFePO4 capacity than 65Ah?

Jan Zastera
Prodigy 250 points
Part Number: BQ40Z60
Other Parts Discussed in Thread: BQ34Z100,

Hello guys,

can I ask you, is it possible to modify schematic or program device to accept higher capacity of cells? Now we would need 100Ah, but it would be nice to have up to 200Ah.

Thank you and kind regards,

Jan

  • 0
    TI__Mastermind 33541 points

    Hey Jan,

    The BQ40z60 supports up to 29Ah. If you want to use very large capacity batteries I would recommend using the BQ34Z100 as this gauge can support up to 320 Ah.

    Regards,
    Nick Richards

  • 0 in reply to Adrian
    Prodigy 250 points

    Thank you, Nick.

    anyway BQ34Z100 cannot support SMBUS communication. Any idea for IC which supports LiFePO4 4S cells with SMBUS, ideally with protection and balancing.

    Thank you very much.

    Kind regards,

    Jan

  • 0 in reply to Jan Zastera
    TI__Mastermind 33541 points

    Hey Jan,

    Unfortunately, we do not have a gauge with SMBUS communication that can support batteries at such high capacity.

    Regards,
    Nick Richards

  • 0 in reply to Adrian
    Prodigy 250 points

    Hello Nick,

    no problem, we can use this IC and communicate with it through I2C and make our own SMBUS communication with external MCU..

    Can I ask you, do you have some reference design, which would use this IC and some protection circuits for LiFePO4 cells? If not, can you foward me to the right IC from our assortment, which would do:

    1) Protection of the cells (over current, overdischarge, short circuit protection etc.)
    2) Ballancing single cells


    Thank you very much for your support!

    Kind regards,

    Jan

  • 0 in reply to Jan Zastera
    TI__Mastermind 33541 points

    Hey Jan,

    For your application I would recommend using the BQ34Z100 paired with a Texas Instruments Monitor. The monitor will be able to cell balance and will also  have protections. I will share a link to the BQ34Z100 EVM guide which has a reference schematic. I am not too familiar with Monitors so you should post  another question in the Monitor forum to get advice on the best monitor for your application.

    www.ti.com/.../sluu904b.pdf

    Regards,
    Nick Richards