Project 1
1.Design a battery pack for a car roughly 150 Kw with 120 V. Use 3500 mAh 3.6V nominal NMC chemistry cell.
a. Design the battery pack configuration.
b. Draw the BMS topology for this battery pack.
2. Build a 3S2P battery pack configuration with generic battery block using Matlab/Simulink.
AIM:
1.Design a battery pack for a car roughly 150 Kw with 120 V. Use 3500 mAh 3.6V nominal NMC chemistry cell.
a. Design the battery pack configuration.
b. Draw the BMS topology for this battery pack.
2. Build a 3S2P battery pack configuration with generic battery block using Matlab/Simulink.
1.Q
given that
for car
power = 150 kw
voltage = 120 v
for battery
nominal voltage = 3.6
capacity = 3500mah=3.5ah
To configuation of battery pack we need how many cell are connected in series and parallel
To find number of cells are connected in series
no of cells connected in series = requried voltage/nominal cell voltage
= 120/3.6
= 33.33 v
rounding off higer and lower values
case 1 lower value 33 no of cells in series * nominal voltage 33*3.6= 118.8v requried is 120
case 2 higher value 34 no of cells in series * nominal voltage 34*3.6=122.4v requried is 120
so the we will select lower value because the voltage must be below or equal to load voltage it should not exceed the load voltage
therefore the number of cells in series is = 33
to find number of cells in parallel
no of cell in parallel = requried capacity / cell capacity
therefore requried capacity = current = power/voltage
= 150*1000/120
= 1250ah
no of cells in parallel = 1250/3.5
= 357ah
rounding off higher and lower values
case 1 lower 357 no of cells in paralle*cell capacity 357*3.5=1249.5 requried is 1250
case 2 higher 358 no of cells in paralle*cell capacity 358*3.5=1253 requried is 1250
so that well we select higher value beacuse capacity is must more then tha rated capacity
therefore the number of cells in parallel = 358
battery pack configuration is 33s358p
the number cells in series is more then 18 so we will subsystem is 18 and 15
the number cells in parallel is more so the subsystem is six six set of 44 and two set is 47
six set of 18s44p and 15s44p
two set of 18s47p and 15s47p
and battery pack topology is master slave topology
2.Q
given that 3s2p battery pack degise
requried cell specification
