Measure Internal Resistance of Li-Ion Battery pack

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1

For checking of single cell li-ion i see there is method of voltage divider by applying load and without load voltage check method. But how this will work in multiple series cell in battery pack ex.12s battery.
I see some Some ISDT Devices measuring the IR of multiple cells.
So i wonder if this all doing with some standalone IC or by switching some FETs and load Resistance Making this possible
Thank You : )

2

I dont see them, where are they?

I dont think it will. If the internal series resistance is high how will you know which cell is defective

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3

Check this
This one by TEnergy Device for Max 7s ..
TEnergy Device YT
Checking each cell IR from Balance port.. connecting each cell one by one to load Resistance..

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