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BQ24610: BQ24610 not charging dead battery (0V)

Esakkimuthu Shanmuganathan
Intellectual 285 points
Part Number: BQ24610

Hi,

We are using BQ24610 in our project to charge the 7.7V Li-ion battery. 

Recently, the battery drained to 0V by application,  and battery charging was not happening when we connected back AC adapter. When we were measuring Pre-charge current using current probe, we observed that Pre-charge current is 0 . In the design, Pre-charge current set to 150 mA. 

What could be the issue here ?. Please suggest

Thanks and Regards,

Muthu

  • 0
    TI__Mastermind 24075 points

    Hi Muthu,

       Can you toggle the CE pin, as well as do a POR by plugging in and plugging out the adapter, when VBAT = 0V and you observe no charge? Can you simulate this scenario without using a real battery, and figure out the VFB voltage at which you see charging occurring?

    Discharging a real Li-ion battery so low is dangerous.

  • 0 in reply to Kedar Manishankar
    Intellectual 285 points

    Hi Kedar,

    Thanks for your reply.

    Yes, we are observing no charge when VBAT = 0V.

    Can you tell that how to simulate BQ24610 without real battery ?. I have read one of the threads in the forum that Bi-directional power supply is needed for this. Should I set 0V in the bi-directional power supply ?

    Thanks and Regards,

    Muthu

  • 0 in reply to Esakkimuthu Shanmuganathan
    TI__Mastermind 24075 points

    Hi Muthu,

       Yes, using a bidirectional sourcemeter (we use KE24xx) along with a bulk cap (100mF) simulates the biquadrant battery which can sink and source current. Setting 0V on this will simulate 0V battery. However as your battery chemistry is Li-ion, deeply discharging so low is extremely dangerous as Liion battery can severely swell  when over discharged. Is there a reason why your system design allows Li-ion battery to discharge so low?