BQ34Z100-G1: Resistance Table During Learning Cycle

Fahad Akhtar

Part Number: BQ34Z100-G1

I am using TI BQ34Z100-G1 EVM which can only support upto 2A of current. I need to do learning cycle, but my cell capacity is greater than 100Ah. This means using the EVM, my discharge current will be less than minimum recommended value of C/10. TRM says that resistance tables will not be updated if discharge current is low, my question is how critical it is to update resistance table for guaging performance assuming everything else in the learning cycle goes as recommended?

FYI, for now I am only testing the guage operation with EVM, for actual product we will offcourse redeisgn the board to suppprt higher amp

Best regards

Fahad

over 3 years ago

0 Dominik Hartl11 over 3 years ago

TI__Guru 62446 points

The gauge requires cell resistance updates. I recommend changing the sense resistor on the EVM to a smaller value and then scale the currents accordingly. Basically the reverse of what is explained in https://www.ti.com/lit/an/slua792/slua792.pdf. The same ideas apply, except for large currents.

0 Fahad Akhtar over 3 years ago in reply to Dominik Hartl11

Prodigy 210 points

Will it be enough to just change the sense resistor? Can rest of the EVM components in the current path (copper traccks, pack connector etc) handle higher currents (upto 30A)?

0 Dominik Hartl11 over 3 years ago in reply to Fahad Akhtar

TI__Guru 62446 points

You may have to modify these for 30A. They are not designed nor tested for 30A or higher currents. But that doesn't mean that they won't work. It's just outside what TI looked at when making this EVM.

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BQ34Z100-G1: Resistance Table During Learning Cycle