BQ40Z60: Can't get a valid charge termination

gilles MICHEL40

Part Number: BQ40Z60

Hi all,

Following datasheet , the condition for a valid charge termination are :

All of the following conditions must occur for two consecutive 40-s periods:
Charging (that is, BatteryStatus[DSG] = 0) AND AverageCurrent() < Charge Term Taper Current AND Max cell voltage1..4 + Charge Term Voltage ≥ ChargingVoltage() / number of cells in series AND The accumulated change in capacity > 0.25 mAh.

In our case, we cannot reach Valid termination because the condition : Charging (that is, BatteryStatus[DSG] = 0) does not have a duration of more than 10 sec

What condition can make BatteryStatus[DSG] = 1 after a complete charge of the battery ?

Regards

Gilles

over 6 years ago

0 Batt over 6 years ago

TI__Mastermind 42535 points

Please make sure that you use primary charge termination thresholds that would get you to the 40s window. For this your charging voltage has to be sufficiently high and your chg I must be lower than taper current for the window.

It is unlikely that your chgfet would turn off before that. However a log of your chg and your settings would be useful if you want to us to take a detailed look.

0 gilles MICHEL40 over 6 years ago in reply to Batt

Intellectual 410 points

Hi Batt,

Find here the log and setup of discharge and charge.

We never get a valid charge termination.

Sorry about lots of data (Battery works day and night,not me). final phase of charge is in the file named : adok_log_270619_charge2.log

Regards

Gilles

adok_log_270619_charge.zip

0 Batt over 6 years ago in reply to gilles MICHEL40

TI__Mastermind 42535 points

Gilles,

Looking at this is going to take a week. Please expect a reply by next Friday.

0 Batt over 6 years ago in reply to Batt

TI__Mastermind 42535 points

Hi Gilles,

Looking at your log you have a current that is all over the place. You never chg or dsg continuously enough for the gauge to achieve taper.

My suggestion is that you use defaults and then run a chg dsg cycle.

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BQ40Z60: Can't get a valid charge termination