Begginers Guide to Processing 18650 Cells | Cell Database


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FBMS - FERCSA's bms
#1
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Hi!

I started thinking about a very simple cell balancing system. Of course passive, but smart. Basically every pack gonna get a balancer module then daisy chained together. So only 3 wires needed because of the i2c line and gnd. The power come from the pack, before you ask my guess is the consumption in idle should be around a few mA. Then all data goes to the master module for data collection, monitoring, display on a web interface etc.. Option for configuring every balancer module from the master.

The specs is the following:
-it can be used in stand alone mode aka top balancing the cell on default.
-bottom balancing is a option if master is present.
-configurable over voltage and low voltage threshold
-isolated data(i2c) connections!
-max. 2A or 4A balance current, both are possible because the selected mosfet can handle it.
-more than one temperature sensor for safety
-cheap-o, my guess is around 6-7EUR per module, but definitely under 10EUR.

What do you think? Any suggestion? Any other function do you like to see? 
Or I should scrape the whole thing then reverse engineer the longmon's protocol? Big Grin
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#2
Definitely, do your own work would be quicker and for €10EUR for longmon is it worth the effort to rip off someone else's work?
http://www.hbpowerwall.com for a full video diary of my project.... 
https://www.amazon.com/shop/hbpowerwall to buy stuff I use Smile 
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