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bq78350: bq78350 battery Can not fully charged. Overcharge Protection actived

James.Z
Prodigy 210 points
Part Number: BQ78350
Other Parts Discussed in Thread: BQ78350, BQSTUDIO

Dear Dear,

I am testing a new 18650VTC6 6s3p battery pack with controller Bq79630 + Bq78350.
I am just a user, and I don't have EV2x00 and Bqstudio installed.
I read registers data by SMBus under sealed mode.

The problem is :
When cell voltage is close to 4V, RSOC becomes 100, then charge Mosfet will be switched off automatically.
Seems Overcharge Protection is actived：BQRemainingCapacity() ≥ FullChargeCapacity() + OC:Threshold
So the battery can not be fully charged.
And every time the bat is discharged to RSOC=0, different FCC can be found at the time when 7% soc is crossed.
since every cell is only 4V around,  the FCC is almost 2000mAH smaller than the design value 9000mAH.

SEEMS the manufacture did not configure the battery parameters good?
or 3.10 3.10 Overcharge Protection  should be disabled by manufacture?
or  OC:Threshold 300mAH could be enlarged to 3000mAH?

Regards!

  • 0
    TI__Guru 54715 points
    Hi tyouigou,
    Yes, configuration is determined by the manufacturer. If it is configured, overcharge protection can turn off the Charge FET. It is also possible to have configured to set RSOC to 100% at charge termination. Check with your manufacturer.