BQ34Z100-G1: SoC Jump and Changed QmaxDOD0

Shilpa Anbalgan

Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQSTUDIO,

Tool/software:

Hello,

We seem to be noticing abnormal SoC jumps on our batteries, especially when it's left idle. The SoC jump is inconsistent and not always repeatable , which makes it difficult to identify the root-cause. We managed to capture one of such incidents on BQStudio.

This battery had 62% SoC to begin with , and was sitting idle. After a few days, the SoC dropped to 16%.

We also noticed the QmaxDOD0 on this battery changed way Off of what it should be

Please see the attached BQStudio log file.Battery0425.log.xlsx

over 1 year ago

0 Diego over 1 year ago

TI__Mastermind 25615 points

Hi,

Was a ChemID match obtained?

Was a learning cycle completed?

Regards,

Evan

0 Shilpa Anbalgan over 1 year ago in reply to Diego

Prodigy 70 points

Hi Evan,

We had our cell characterized by TI , and the chemID obtained was 4114. It did go through the learning cycle correctly.

0 Diego over 1 year ago in reply to Shilpa Anbalgan

TI__Mastermind 25615 points

Hi,

Thanks for confirming and for the log file.

The log file you sent has no current reading, this is a major issue if your device is not reading the current from your battery.

Regards,

Evan

0 Shilpa Anbalgan over 1 year ago in reply to Diego

Prodigy 70 points

Hello,

Thank you for your input.

We were also performing a cycle test on this battery, with no 'rest period' in-between charge and discharge cycles (To replicate a real-life scenario on how this battery is used by our customers ).

We don't have log files from our customer's battery, but we ran consecutive charge/discharge cycles with no rest periods in-between in our test. Do you think that could be causing SoC jump problems?

0 Adrian over 1 year ago in reply to Shilpa Anbalgan

TI__Mastermind 37761 points

Hello,

Today's a national holiday. We will get back to you tomorrow.

Regards,

TI Apps Team

0 Diego over 1 year ago in reply to Adrian

TI__Mastermind 25615 points

Hi,

The reason for your the SOC jump is the gauge is not detecting any current reading. IT needs accurate Voltage, temperature, and current reding to gauge your battery properly.

Regards,

Evan

0 Shilpa Anbalgan over 1 year ago in reply to Diego

Prodigy 70 points

Hello Evan,

I am attaching another log file from a very recent test

4747.RestAfterCharge47prct.log

We charged the battery only upto 47% SoC . The battery was sitting idle over the weekend with no charge current . The SoC walked up to 57% now.

I would like to know if we as a user have any control over OCVTAKEN on BQ34Z100-G1 , to not enable OCVTAKEN while the battery is Resting ?

0 Diego over 1 year ago in reply to Shilpa Anbalgan

TI__Mastermind 25615 points

Hi,

There is still no current reading on the log file you sent, the gauge needs accurate temperature, current, and voltage reading to correctly gauge the cells.

Regards,

Evan

0 Shilpa Anbalgan over 1 year ago in reply to Diego

Prodigy 70 points

Hi, That is precisely our concern. We have absolutely no leakage current in our system. But the Fuel gauge is constantly jumping between SoC's. This is why we needed your assistance . Is there any Bit setting you can think of , that will avoid this error? This has been a serious issue with our customers. We're seeing it in our lab tests too

0 Diego over 1 year ago in reply to Shilpa Anbalgan

TI__Mastermind 25615 points

Hi,

Please share your schematic.

What value sense resistor is being used?

Have you calibrated the gauge?

Regards,

Evan

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BQ34Z100-G1: SoC Jump and Changed QmaxDOD0