Is it possible to extend the bq40z50 for greater than 4 cells?

Vinod Paliakara

Prodigy 60 points

Other Parts Discussed in Thread: BQ40Z50-R1, BQ76940, BQ78350-R1, BQ76PL455A

We are designing a BMS for a 14S Li-ion pack.

We would like to use state of charge based cell balancing scheme, like it is implemented in the bq40z50-r1.

We can use the bq34z for the 14S pack, however cell balancing is not integrated in it.

over 9 years ago

0 ThomasCosby over 9 years ago

TI__Guru 73830 points

The bq40z50-R1 cannot support more than four series cells. Our best option to support a 14S configuration with cell balancing will be the bq78350-R1 and the bq76940.

0 Vinod Paliakara over 9 years ago in reply to ThomasCosby

Prodigy 60 points

Thomas,

Is the bq76PL455A stackable for pack voltages beyond 80V?

For chips that are stacked, does the GND pin have to be tied to PACK- or can it be connected to an intermediate cell voltage?

0 ThomasCosby over 9 years ago in reply to Vinod Paliakara

TI__Guru 73830 points

Vinod
Please post PL455 questions to the Monitoring and Protection forum. I am not familiar with them.

e2e.ti.com/.../1002

Tom

Power management

Power management forum

Is it possible to extend the bq40z50 for greater than 4 cells?