marka-ee
100 W
- Joined
- Mar 24, 2020
- Messages
- 175
I used to balance charge my 10s packs with ichargers, but after two of the ichargers failed on me, I've had it with ichargers and their bizarre design to get above 8 channels. So I'd like to create my own balancer that would work in conjunction with a bulk charger. A design I'm thinking of :
Each cell gets a voltage divider to bring the cell voltage within the bounds of a 16 channel analog mux. That mux feeds a 16 or 24 bit ADC. The control is handled by an Arduino. The mux and ADC modules ( shields ) are a few bucks each, as is the Arduino. The arduino turns on the balance bleed by turning on a 4n25 type opto which in turn controls the gates of digital-level-gate power mosfets / power resistors. Some of the batteries I use are EV salvage, and I'd like a robust 1 amp bleed current to converge faster.
That's it in a nutshell. No relays, I saw such a design from a few years back on here and it seems odd to me to have moving parts in a balancer in 2020.
The software would scan the cells voltages and apply bleed current as needed. I anticipate pausing for a second or two and let things settle to see how the cells look , then resume bleeding / charging as needed.
I know without a circuit diagram critiquing is hobbled , but is there anything glaringly wrong with this design direction ? I'm not new to arduino coding or electronics in general so I think I can evolve it as I go.
Each cell gets a voltage divider to bring the cell voltage within the bounds of a 16 channel analog mux. That mux feeds a 16 or 24 bit ADC. The control is handled by an Arduino. The mux and ADC modules ( shields ) are a few bucks each, as is the Arduino. The arduino turns on the balance bleed by turning on a 4n25 type opto which in turn controls the gates of digital-level-gate power mosfets / power resistors. Some of the batteries I use are EV salvage, and I'd like a robust 1 amp bleed current to converge faster.
That's it in a nutshell. No relays, I saw such a design from a few years back on here and it seems odd to me to have moving parts in a balancer in 2020.
The software would scan the cells voltages and apply bleed current as needed. I anticipate pausing for a second or two and let things settle to see how the cells look , then resume bleeding / charging as needed.
I know without a circuit diagram critiquing is hobbled , but is there anything glaringly wrong with this design direction ? I'm not new to arduino coding or electronics in general so I think I can evolve it as I go.