Battery Logging - multicell packs

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Battery Logging - multicell packs

Post by AndrewA »

For logging cell voltages in multicell battery packs (li-ion for example), you can use resistor dividers with our picolog 1000's or ADC20/24 loggers.
For the first cell you can have a resistor divider if max. cell voltage is above the logger 2.5V or direct connection.
Attached a schematic file which shows how the divider is connected for 4 cells. You may need to use two picologgers, to monitor more than 16 cells (for a Picolog 1216).
Battery cell logging.png
The xls file has the resistor values and calculations put into the picolog software.
For each channel in picolog you need to setup-
Channel Formula (see G column xls)
Scaled Channel Reading Formula (see I column xls)

You can use ¼ watt resistors , also please use 1% tolerance resistors or better as errors multiple near the end of the resistor divider.
R2, R4 etc resistors you could use trim pots and or fix resistors in parallel to get the right value.

These resistors can be fitted to the picolog 1000's or ADC20/24 loggers own terminal boards-
PL1000 models- ... -guide.pdf
ADC20/24 models- ... -guide.pdf
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Regards Andrew
Technical Specialist

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