Hi Anil,
This solution will work. You will need to scale the current to measure higher than ~32A. This link will help show how to do this:
https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/1300.6562.Gauge-Design-Configurations…
Hi Danilo,
The gauge and monitor can work with much higher currents because they are only observing the voltage across a sense resistor. The current will need to be scaled - the method for current scaling is shown in the presentation linked below. …
Hi Hai,
Just wanted to check - When you scale the current, did you also scale all of the data flash parameters that use mA and mAh? You need to scale all of the current parameters like Quit Current. This presentation shows a list of all the parameters…
Here is the main piece of our schematics. We also used 2000mA for calibration. I2C pull-up resistors are on the different sheet; i hope that doesn't matter much.
Battery_board _Main.pdf
Hi,
For currents higher than 32 A, current scaling must be used. If you use the BQ78350-R2 firmware, you can use the IPSCALE parameter to scale by 10x or 100x. You must then scale all the current parameters by this amount.
Alternatively, you can use…
Hi Hank,
The max value for design capacity is 8000 mAh on the bq27421-G1. You could try to use current scaling to accommodate your battery but you may want to consider using a higher end gauge such as bq27520: which supports up to 65 Ah batteries. …
The bq40z50-R2 datasheet and bq40z50EVM User's Guide have design examples that should help you. I attached a presentation that was given at a BMS Deep Dive event that should help to better understand capacity scaling.
2015_DD_Gauge Design Configurations…
Hi Sai,
IPSCALE should not work for the BQ78350 and this feature was fixed on the BQ78350-R2. Without IPSCALE, the method to do current scaling was to scale the calibration values like in this presentation: https://e2e.ti.com/cfs-file/__key/communityserver…
Hi Zehua,
Please take a look at the attached presentation. It will cover the case of high capacity packs (>29Ah)
Best,
Justin
Gauge Design Configurations for High Charge Discharge Rate Applications.pptx
