BQ27520-G4: About Learning Cycle

Hi Takagi,

This is could be related to the configuration such as the design capacity could be incorrect, can you attached the .gg and log from learning cyle. What are the battery specs?

Best regards,

Hi, Nick

The specifications of the battery are as follows.
・Battery pack capacity：2835mAh (min)
・Nominal Voltage：3.6V
・Discharge End voltage：2.5V
・Charge voltage：4.1V

Best regards,

ver6_Enable impedance track to Discharge.logver6_Relax to Charge .logver6 gg file.gg.csv

Hi User,

The log needs to be from the learning cycle, if you achieved update status = 2 there is no reason to say it failed unless you are having other issue.

Best regards,

Hi,Nick

I was aware that this log data is for debugging and does not affect the learning cycle, but is it different?
The phenomenon that is occurring is the same as the following URL.

Is this normal behavior and is the learning cycle successful?

Best regards,
Takagi,

Hi Takagi,

Update status = 2  means Qmax and Ra updated

If you can share the log from the learning cycle I will be able to give you a better answer.

Thanks,

Hi,Nick

Let me ask you an additional question.
The State Update Status has been updated, but the OCVa0 Table Update Status has not.
Is this a failed learning cycle?

Is this a failed learning cycle? What could be the cause?

Best regards,
Takagi,

Hi Takagi,

After learning has been completed, copy the table that has the learned, ie the qmax and Ra values to the one that are unlearned so both tables will now have the same values. You will know the learned qmax and resistance tables as they will be different from the values which were started out with before the learning cycle. Do the same for the default chem id table as well, i.e replace them with the learned values.

Also copy update status 02 to all the update statuses and copy the learned qmax to all the other qmax.

We have a guide here that may be helpful:

BR,