Project 1
1.
given data
power=150kw, voltage =120v, capacity= 3500mAh, nominal voltage = 3.6
no of cells in series:
no of cells = voltage/cell nominal voltage
= 120/3.6
= 33.3 cells
if 33 cells
motor maximum nominal voltage = no of cells * nominal voltage
= 33*3.6
= 118.8 v
if 34 cells
motor maximum nominal voltage = no of cells * nominal voltage
= 34*3.6
= 122.4 v
since motor maximum voltage requirement not given,being motor voltage seems to be 120v 34 cells will be appropriate because 122.4 v seems to be less than maximum motor voltage requirement.
- no of cells in series = 34 cells
no of cells in parallel:
power rating of motor=150kw
voltage = 120v
current requirement = power rating/voltage
= 150kw/120
= 1250 A
no cells in parallel = Motor current requriement / cell nominal capacity
= 1250/3500*10^-3
= 357.142 cells
motor peak current requirment not given yet if 358 cells maximum current requirement will be 3.49 A
if 357 cells in parallel maximum current requirement will be 3.50 A
so better to go with 358 cells in parallel
- total no of cells in parallel = 358 cells
so final configuration will be 34 S 358 P
it will have four modules 2 module have 11S 358P and 2 modeules have 6S 358P
2.
considering the application, complexcity, implementation mater slave could be the better choice for this 34s358p configuration.
The battery pack consists of four modules each connected to a slave AFE for voltage sensing and the data is passed on to the next slave and the master to the MCU.
CAN and RS485 for communication and temp sensor for temperature sensing and shunt resisitor connecged acreoos the power ilne for current sensing the whole 34s358p configuration splited into four modules
and each modules have slave.