BQ34Z100EVM: BQ34Z100EVM

Randall Simpson

Part Number: BQ34Z100EVM
Other Parts Discussed in Thread: BQ34Z100, GPCCHEM

We are trying to work through characterization of a lithium battery cell. We get a lot of error codes in the log file generated by the Battery Management Studio 1.3.101. Sometimes the logging just shuts down with no warning. Also, we get some discrepancies in the current and voltage through out our test setup.

We are using #12 wire through out the setup. Total length of all the wire is less than 3 feet and each leg is less than 2 feet. The battery is 105 Ah at 3.65 volts. We are charging and discharging using a programmable load and power supply at 10 amps. See diagram attached.

I've worked through a few setup issues, the power supply was residually drawing 24 ma even powered off, so it was showing a little on the log file. The Chem ID file tool indicated an error in the data due to this non-zero number so when we are not charging, I disconnect the lead to the power supply.

The current draw checked with a Fluke clamp on DC amp meter varies through out the setup. The current draw in the software doesn't always agree. Sometimes it take several calibrations.

It seems to be random issues that are killing our data collection and given it is a 27 hour process to do this Chem ID test we don't really want to keep doing it over and over.

Has anyone in the forum had similar issues and is there something wrong with our setup?

Thanks

over 4 years ago

0 Nick Brylski over 4 years ago

TI__Mastermind 19195 points

Hi Randall,

Can you attach your .gg and log file showing behavior.

Thanks,

0 Randall Simpson over 4 years ago in reply to Nick Brylski

Prodigy 65 points

Greencubes 12_09_20.zipThis is a lipo 4 cell 105 Ah 3.2 volts nominal.

Question:

Attached is the default BQ34Z100 .gg file.

Please explain how the .gg file settings influence the GPCCHEM Tool Log File.
I understand that .gg file settings are critical to IT learning and obtaining correct Qmax and Ra table data.
However, for GPCCHEM tool log files we are reporting only calibrated Voltage, Current and Temperature.

Therefore, it does not seem that Data Flash settings should influence the log file output.

Thank you

0 Nick Brylski over 4 years ago in reply to Randall Simpson

TI__Mastermind 19195 points

Hi Randall,

Follow the guide here:

Best regards,

0 Randall Simpson over 4 years ago in reply to Nick Brylski

Prodigy 65 points

Nick, please give me the contact information and requirements to send a cell to TI for Chem ID characterization. I checked with a co-working in another division, he is experiencing all the same issues I have. We plan to use several million dollars worth of the cells in our products. What ever the cost is to have TI do the characterization is worth it.

Thanks

Randy

765 860 1598

0 Nick Brylski over 4 years ago in reply to Randall Simpson

TI__Mastermind 19195 points

Hi Randy,

I sent you a friend request, we can discuss this offline.

Best regards,

Power management

Power management forum

BQ34Z100EVM: BQ34Z100EVM