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BQ34Z100-G1: Designing Battery Pack Protection Features

Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ29209, BQ40Z50

Hi All,

I am using a 2S battery pack sold by RS with built-in over/under voltage and over current protection and BQ34Z100-G1 as pack side fuel gauge. After about 50 cycles I am reading 20-30 mV cell imbalance issue with no way to correct it.

Therefore I have been searching for a suitable fuel gauge with full support for I2C, cell balancing and over/under voltage and over current protection. Unfortunately such product does not seem to exist. I am looking for recommendations but the closest combo I have found is:

BQ29209 for Cell balancing and Over voltage

BQ34Z100-G1 for fuel gauge

No support for under voltage and over current protection 

Any guidance would be helpful.

Thanks

Kam