izeman
1 GW
my lipo battery is aging, and is about 4 years old now. it's down to 80% capacity, and it is time to replace it. i never had a single issue with any lipos over the years, be it in my bike or in the quadcopter, rc car ....
still the 18650 cell looked interesting to me, and i thought how a switch could happen.
the current configuration is 8 packs of 6s 5.000mAh zippy 20c rc-lipos cells. the pack weighs around 6.2kg and has a nominal capacity of 3,7V * 12s * 5.000mAh * 4p = 888Wh.
i took a lot of measurement of the available space in my self-made frame, and the space available is 370x50x110mm. thanks to the great help and support of maddin88, we found a very good solution which uses the space ideally. totally i can fit 150 cells into the frame. 2 packs of 75 cells in a 15s3p configuration. the cells will be arranged in a 3s5p honeycomb layout and then folded. this will give a long pack of 50x105x350mm.
150 cells will make the capacity much larger. from 888Wh to 3,6V * 15s * 3.000mAh * 10p = 1.620Wh (almost double the capacity), at 6.8kg. the pack is more heavy because it has more volume, and fills the room much better then the lipos which needed a connection pcb in the middle.
the sag will be much worse than before, but due to higher voltage (44.4V compared to 54.0V) the current will come down and range may be doubled.
this is what the bike looks right now:
still the 18650 cell looked interesting to me, and i thought how a switch could happen.
the current configuration is 8 packs of 6s 5.000mAh zippy 20c rc-lipos cells. the pack weighs around 6.2kg and has a nominal capacity of 3,7V * 12s * 5.000mAh * 4p = 888Wh.
i took a lot of measurement of the available space in my self-made frame, and the space available is 370x50x110mm. thanks to the great help and support of maddin88, we found a very good solution which uses the space ideally. totally i can fit 150 cells into the frame. 2 packs of 75 cells in a 15s3p configuration. the cells will be arranged in a 3s5p honeycomb layout and then folded. this will give a long pack of 50x105x350mm.
150 cells will make the capacity much larger. from 888Wh to 3,6V * 15s * 3.000mAh * 10p = 1.620Wh (almost double the capacity), at 6.8kg. the pack is more heavy because it has more volume, and fills the room much better then the lipos which needed a connection pcb in the middle.
the sag will be much worse than before, but due to higher voltage (44.4V compared to 54.0V) the current will come down and range may be doubled.
this is what the bike looks right now: