GoldenMotor.com Forum

General Category => General Discussions => Topic started by: rolf_w on May 08, 2010, 10:07:37 PM

Title: 48V Battery Management System
Post by: rolf_w on May 08, 2010, 10:07:37 PM

My 48V BMS is damaged and I received a replacement from GM. The damaged one has a smaller printed circuit board (PCB) sitting on top of the main board. It mainly contains resistors which are probably used as loads to dump some 'bleeding' power? The new board is identical to the damaged one, however the smaller 'resistor PCB' is missing. I have no idea if this is a mistake or ok. what is the function of the smaller piggyback PCB? can it be left out and the BMS still works? I am confused! r

Title: Re: 48V [acronym=Battery Management System][color=teal]BMS[/color][/acronym]
Post by: rolf_w on May 10, 2010, 04:40:26 PM

As GM Li-ion batteries are NOT using LiFePO (iron phosphate) cell chemistry but LiMn2O4 (manganese oxide and probably adding Co) , the readily available LiFePO BMS can not be used (too low voltage). Has anybody found a convenient replacement? rolf_w