And also, how do I properly read individual cell voltages

Question

IoT / Electronics

Voltangle 🇨🇿🇺🇦

And also, how do I properly read individual cell voltages

in a pack? Can’t quite wrap my head around it

0

25.08.2023

3 ответов

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Voltangle 🇨🇿🇺🇦 Автор вопроса

Vim
I'm not 100% sure about this, but I intended to ma...

The main problem is that to measure cell voltage I need to have two wires (positive and negative) going from it to the ADC, not one

0

25.08.2023

SirJoe

Voltangle 🇨🇿🇺🇦
The main problem is that to measure cell voltage I...

There are already developed open source projects tha you can use as a reference like SmartBMS or foxBMS FoxBMS uses LTC6813 to convert from differential voltages to digital

0

25.08.2023

Vim · Accepted Answer

I'm not 100% sure about this, but I intended to make a circuit like that for my UPS boards as well. The first issue I came across is that the voltage while the cells are charging, will be higher than the cell voltage by ~200-300mV. So you'd have to stop charging while you're measuring. As for processing the analog voltage, I guess your best bet would be an analog pin on your microcontroller for each? It is possible to make one pin do the job of many with a multiplexer, but I think that's only for digital signals.

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And also, how do I properly read individual cell voltages

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