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BQ78350: BQ78350: the selection for auto ship and sleep

Lenna Yan
Intellectual 1960 points
Part Number: BQ78350

Hi, 

The corresponding battery model can be selected in Chemistry. However, due to the consideration of life problem, the voltage range is reduced from 2V-4.25V to 3-4V. And then the RSOC is not correct, but after learning, the result become more accurate. Considering long -distance transportation, select ship function(small self-consumption). While ship mode means shutdown, when restart RSOC will reduce from 100% to 75%. 

Question: which mode should be selected?

Best regards,

Lenna

  • 0
    TI__Mastermind 42535 points
    Lenna,

    Ifyou're asking whether lifetimes are improved by choosing a higher termination voltage, then no. It really has no effect. However a lower charge termination voltage can improve lifetime by reducing deposition on electrodes. If you configure your chemistry and termination correctly, your RSOC will change appropriately. That is, on startup you will not get a large drop because RSOC is also a function of charge termination voltage.
  • 0 in reply to Batt
    TI__Intellectual 1960 points

    Hi Batt,

    Thank you for your reply. I have something want to confirm. You said choosing a higher termination voltage won't affect the lifetime. Does that mean it is no need to decrease the voltage from 2~4.25V to 3~4V?

    If changing the terminal voltage correctly, RSOC will be good. right?

    Regards,

    Lenna

  • 0 in reply to Lenna Yan
    TI__Mastermind 42535 points
    Hi Lenna,

    What I meant is that you don't need to increase the full discharged voltage (terminate voltage) to 3V. You can go to 2V. However, reducing the charge termination voltage from 4.25V to 4V will help increase lifetime.

    Yes, with proper charge termination config the RSOC will be correct.