Project 1 Mechanical design of battery pack
Cell:Cell: ANR26650M1-B
NR26650M1-B 
single cell energy(Wh)=cell capacity x cell voltage(V)
=2.6*3.3
=8.58Wh
cell density
volumetric energy=single cell energy/volume of each cell
=8.56/003451
=245.62Wh/m^3
Graimetric energy=single cell energy/mass of single cell
=8.58/0.076
=112.89Wh/kg
calculation for battery pack
assume to achieve 250km in 18KWh and 145.2 nominal voltage for series connection
vehicle range=250km
number of cell in series=nominal voltageof series / nominal voltage of single cell
=145.2/3.3
=44 cells in series.
energy for battery pack=cells in series *single cell energy
=44*8.58
377.52wh
number of cell in parallel= total energy/energy of battery pack
=18120.96/377.52
= 48 cell in parallel
battery capacity=parallel cell*single cell capacity
48*2.6
124.8Ah
total cell = series*parallel
=44*48
2112 cells together
mass of the battery pack =total mass *singlr cell mass
2112*0.076
160.512kg is the mass of the batteries connected in series and parallel.
Total volume =total cells*volume of single cell
=2112*0.0345
=72.89m^3
cell peak current =c rate*single cell capcity
20*2.6
=52A
battery pack peak current=cell peak current*cells in parallel
=52*48
=2496A
battery peak power=peak current*voltage in series
=2496*145.2
362.42W
cell cont. current=c rate*single cell capacity
10*2.6
=26A
battery pack cont.=cell cont.* cells in parallel
26*48
=1248A
battery pack power=cont. current*voltage of series connection
=1248*145.2
=18.120Kwh
Power(p)=Voltage(v)*Current(i)
3.3*2.5=8.25kw
for 18kwh, 48s 48p
ie, 48*48=2304cells
series connection 48*3.3=158.4V
parallel connection 48*2.5=120A
158.4*120=19.008kwh
Battery holder , spacer for cell cylindrical li-ion
final packing :
