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How does a BMS monitor individual voltage?

NomNomCameron

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Mar 25, 2020
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Given that you only connect the BMS to the main battery negative and then positive leads to each individual cell, how does a BMS calculate the individual voltage of each cell?
 
Each cell will be the cell voltage it is measuring plus all the ones in the series before it. The BMS just subtracts the difference.

If you have a regular volt meter, it will help you understand by putting the - on the - and then moving the + from cell to cell in series.
 
Each cell will be the cell voltage it is measuring plus all the ones in the series before it.

Did you mean minus all the ones before it?

This may be a dumb question but in order for this to work properly, you need to make sure that "first cell positive" is the same cell that the main negative is on and then make sure each cell after that is the furthest cell (leftover that hasn't been connected) from the cell that has the main battery banks positive lead, making that cell the last one connected to the BMS?

My sincerest apologies if that explanation was more complicated than it needed to be, I hope it makes at least a little bit of sense haha
 
Get 4 AA batteries and just lay them down on the table in front of you.

- on the left + on the right.

Make one long line.

B- OOO +1- OOO +2- OOO +3- OOO +4

B is the negative
1, 1.5V
2, 3.0V
3, 4.5V
4, 6.0V
 
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