Hi every one,
i am thinking of building a diy battery extender for my 2014 nissan leaf.
after some searching i found these two youtube chanels that have done what i want to do
and i think i can make it
the leaf has 24kwh battery pack
48 cells in series so 8v*48cels=386v
each cell have 62ah (24.000watt/386v)
i would like to use 18650 li ion cells
i get that i have to highjack the signals from the battery pack's contactors to disengage the battery extender pack when the main pack is disconnected.
what i don't get is how they charge the batteries ( by connecting it in parallel to the main pack it is charged while the main pack is charged )
but how do they balance it ?
so my uncertainty is which battery pack format should i use (i am thinking a 24kw battery pack option a) 18 modules in parallel each being 96s1p b)18 modules in series each being 1s18p
option (a) means that i don't have to make all of them at once and i can add them over time but how can i ballance each module being 96s1p it's large an i have to balance on the cell level
option (b) means that 1s18p per pack ,so each pack is self balancing but still i have to ballance the packs between them
i would love for some wisdom