Hello there,
I'm currently working on a college project on Al-ion cell. We are planning to build a 4S battery pack as our first trial test and also hoping to attach a BMS for additional safety. since the voltage & current limit for charging the Al-ion cell is totally different from Li-ion cells, we are left with the option of building a custom BMS for our application.
On looking into the web, I found some BMS circuits for Li-ion using TL431 (pic attached) which does the balancing function. Also, found few youtube tutorials on it as well. I'm hoping to modify this circuit for making our custom BMS.
for our project we need to balance the cell at 1.6V rather than the usual 4.2V range for Li-ion. Since the circuit comes with a potentiometer for adjusting the balancing voltage, I believe I could use that for the intended 1.6V but need to confirm with you guys.
plus, I like to have under voltage protection as well; at 0.6V. Could I use the separate TL431 circuit for that? where the cell once reaching 0.6V triggers a transistor and cut-off the battery pack discharge line.
would love to hear your thoughts on this. Thank you
EDIT: I found the below youtube video which explains a circuit using the Lm339 IC. It have overcharge, undercharge, temperature & over current protection. It looks promising but still not suitable for my lower voltage use case. could anyone suggests some modification to this circuit for my application.