I need to make a battery pack 2 batteries in parallel x 2 in series (ie total 4 batteries) using some 18650 cells (without built in protection). I have found a suitable 2S cell ppreotection IC with cell balancing, over current, over / under voltage etc. that looks good, but I guess I need to have individual cell protection instead or as well, as if one of the cell fails for example, the charge discharge current could end up being handled by one cell alone.
What would peoples recommendations be? There seems to be a vast number of ICs out there but non of them seem to do everything, they might do single cell over / under voltage, but no current limit, they might do 2S cells but have no cell balancing (and its a pain if I have to do this with a separate circuit its hard to make a circuit that doesn't consume power while not in use, and in a way it is bypassing the under voltage protection!)
What would peoples recommendations be? There seems to be a vast number of ICs out there but non of them seem to do everything, they might do single cell over / under voltage, but no current limit, they might do 2S cells but have no cell balancing (and its a pain if I have to do this with a separate circuit its hard to make a circuit that doesn't consume power while not in use, and in a way it is bypassing the under voltage protection!)