Does anyone know of a really simple 10S BMS that’s only purpose is to cut the circuit from a simple laptop brick style charger when the battery reaches 42V?
I.e I don’t want it to do balancing of any kind as this adds a lot of extra wiring to my build that I don’t really think I need as my battery is made out of 10 separate, easily removable 1S6P 18650 packs so I can balance them separately when necessary.
I had just assumed you still needed some form of BMS to cut the circuit when the battery reaches a specific voltage unless you use something like a hobby balance charger?
When you are using BMS with brick charger, the charger limits the voltage and the BMS balances all the cells to be equal, tahts how I understand that There are also some protection circuits in the BMS limiting the max voltage which can be a problem when you are regen braking on a full battery
Sounds like you don’t need a BMS at all. If the charger is at 42V, once the battery reaches 42V it will stop drawing current and basically stop charging. The (end-to-end) battery voltage will never go above the charger voltage. HOWEVER if any of your cells or P packs are weak, then the other cells/p-packs will overcharge to compensate for it, that’s what the balancing prevents
edit: When I say “weak” I don’t even necessarily mean weak, just relatively slightly weaker than the other ones. So in effect there is some self-balancing action happening because once one gets a little weaker it will overcharge the others and once they get slightly damaged and take less of a charge, they will be back in balance again. A bms just does this balancing without damaging anything.