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BQ25630EVM: can't make the battery full of charging on the EVM

Jimmy zhou
Prodigy 50 points
Part Number: BQ25630EVM
Other Parts Discussed in Thread: BQ25630, EV2400,

Tool/software:

Hi TI expert,

i have one problem that the battery can't be charged full (my battery CV is 4.45V) on the EVM of the BQ25630 when i set the below parameter (as below capture) and others kept as default setting, even if the charger IC entered the termination current and stopped to charge (as below charging flow data), but the battery fuel gauge info still shown the 97% voltage not 100% when i read it by EV2400(as below capture). i don't know where parameters need to be set and configured on the EVM, could you please give some suggestion on that for me? thank you very much!

Parameter setting.

Battery charging flow.

Battery fuel gauge info.

  • 0
    TI__Mastermind 31420 points

    Hi Jimmy, 

    Thank you for sharing details on your device configuration in your testing. Please see my comments below. 

    How do you have the BQ25630EVM, fuel gauge, and battery connected in your test setup? If possible please help to share a picture for my reference. I ask about this because the BQ25630 determines end of charge voltage based on the voltage measured by 'BATP' (battery voltage sense) pin. On the EVM this pin is routed to the J4 Bat terminal block. Additional wiring from EVM to fuel gauge to real battery terminal may be the cause of minor voltage drop and battery only charging to 97% rather than 100% as a result. 

    In the final product recommended design would be to connect BATP voltage sense pin as close as possible to actual battery terminal for most accurate battery voltage sense, which will then allow proper charge to full charge voltage. 

    Best Regards,

    Garrett 

  • 0 in reply to Garrett Kreger
    Prodigy 50 points

    Hi Garrett,

    thank you for the quick response. the following picture is the setup of the battery charging, shared it with you for reference. hope to get your suggestion about the battery full of charging issue solving.

  • 0 in reply to Jimmy zhou
    TI__Mastermind 31420 points

    Hi Jimmy, 

    Thank you for your reply. 

    What voltage do you measure via a multimeter at TP35 (BATP) on the BQ25630EVM when battery charge current is <150mA? 

    I would also like to reiterate my key point that battery voltage sense function of BQ25630 will be optimized on a custom/end application PCB where BATP can connect to battery terminal rather than testing with the EVM board connected to gauge board and then battery. The test setup is the most likely cause of gauge device indicating 97% charger rather than 100%. 

    You can achieve a more full charge by increasing VREG setting a small amount, such as by 10-20mV, or reducing ITERM setting below 120mA, but these configuration changes may not be recommended for testing with your real battery. 

    Best Regards,

    Garrett