BQ34110: Application guide how to configure automatic learning procedure and EOS feature

Sergii Makovetskyi

Part Number: BQ34110

Dear support team,

we are using BQ34110 IC at our custom design of the UPS system, to check battery status and battery health.

According to TI post (How do you detect battery aging in rarely discharged applications) - it is possible to discharge the battery by 1%-2% to check EOS.

Questions:

Do you have some application notes, how to configure gauge IC for automatic learning procedure, that should run periodically?
Will the gauge provide accurate information about battery charge In case if learning procedure will run periodically with discharging by 1% - 2 %? Or at some point, full discharge is needed?

Best regards,

Sergii Makovetskyi

over 4 years ago

0 Wyatt Keller over 4 years ago

TI__Guru** 105760 points

Hello Sergii,

The bq34110 reports the SOH of the battery, it is up to your system requirements at what SOH it is not good enough. For the CEDV gauges you will need to periodically fully discharge them so hey update the FCC value and then it can use that data for SOH.

Sincerely,

Wyatt Keller

0 Sergii Makovetskyi over 4 years ago in reply to Wyatt Keller

Intellectual 495 points

Hello Wyatt.

thank you for the answer.

can you please tell me - for using CEDV:

1 - how often we have to completely discharge the battery?

2 - Is it possible to discharge to ~50% only, or definitely full discharge is needed?

Best regards,

Sergii

0 Wyatt Keller over 4 years ago in reply to Sergii Makovetskyi

TI__Guru** 105760 points

Hello Sergii,

It depends on your system and ho much the battery is degrading, it should be as frequent as you can, usually around once every 1-3 months.

No you will need to discharge down near EDV, the conditions to qualify a discharge are explained in the TRM, section 2.7.3 Capacity Learning (FCC Update) and Qualified Discharge.

TRM: www.ti.com/.../sluubf7a.pdf

Sincerely,

Wyatt Keller

0 Sergii Makovetskyi over 4 years ago in reply to Wyatt Keller

Intellectual 495 points

Hello Wyatt,

thank you for the answer, will do some testing and back to you!

Best regards,

Sergii Makovetskyi

0 Sergii Makovetskyi over 4 years ago in reply to Wyatt Keller

Intellectual 495 points

Hello Wyatt,

I am working now with the BQ34110 configuration.

I have 2 batteries with the same part number - one that is almost died and can't keep the charge and 2nd one, that almost new.

I want to run calibration at the new battery and run few auto-learn cycles. After that I want to connect died battery and check that EOS changed to low value.

Please advise how that could be done.

I have made next config:

1 - Settings - > Manufacturing -> EOS_EN set High

2 - Settings - > Manufacturing -> PCTL_EN set High

3 - End Of Service - > Resistance learning -> Auto learn time set to 1h

4 - End Of Service - > Resistance learning -> Auto learn time Retry set to 1h

5 - End Of Service - > Resistance learning -> Learn discharge Current set to 195mA (load, connected to FET, controlled by LEN)

Then I have a question - as I understand - learning should be done only when charging is absent. Correct? But IC has no controls for disabling charging to the battery. So, how autolearning could work then? Or it will start only during discharging?

Best regards,

Sergii

0 Nick Brylski over 4 years ago in reply to Sergii Makovetskyi

TI__Mastermind 19195 points

Hi Sergii,

If there is a qualified discharge of the battery you should see EOS alert accordingly.

Best,

0 Sergii Makovetskyi over 4 years ago in reply to Nick Brylski

Intellectual 495 points

Hi Nick,

thank you for the answer. But I still can't find out. Do you have step by step guide somewhere on how to configure EOS functionality?

Best regards,

Sergii

0 Nick Brylski over 4 years ago in reply to Sergii Makovetskyi

TI__Mastermind 19195 points

Hi Sergii,

Refer to the TRM.

Best regards,

Power management

Power management forum

BQ34110: Application guide how to configure automatic learning procedure and EOS feature