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BQ24295: BQ24295 question

Mickey Zhang
Genius 12080 points
Part Number: BQ24295

Hi team,

The customer would like to get if he uses BQ24295  to charge to a battery which has been overcharged,

then if there is the charging current in the circuit. Can the battery be charged? What the charging process is?

The  battery voltage is closed to 0V. 

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments

  • 0
    TI__Genius 10240 points
    Mickey,
    If the battery is higher than the voltage set by REG04, the BQ24295 would not charge the battery. It is not clear about the source of the the charging current in your statement "if there is the charging current in the circuit". What do you mean "the batter voltage is closed to 0V" vs. "a battery which has been overcharged"? It looks like you are asking a case that the battery is over discharged instead of overcharged, correct?
    Regards,
    Eric
  • 0 in reply to ezhao
    TI__Genius 12080 points
    Hi Eric,

    Thanks for your help. Yes, I mean that the battery is over discharged. The battery voltage is close to 0V.
    So it is over discharged.
  • 0 in reply to Mickey Zhang
    TI__Mastermind 25800 points
    Hey Mickey,

    If the battery voltage is below the precharge voltage threshold, called VSHORT and VSHORT_HYST in the datasheet EC table, then the charger is in a trickle charge mode. When the battery voltage is at such a depleted state, the charger will supply a safe, low current called ISHORT in the EC table to attempt to charge a very depleted cell. The low current makes also limits the current in the event of the battery short condition.

    If the voltage remains this low for too long, there is a reduced safety timer to disable charge (I believe ~4hr or so) as this could potentially signal a bad battery. If the voltage does rise, the charging profile will continue as normal.


    Regards,
    Joel H