Challenge

Project 1

Design a battery pack for a car roughly 150 Kw with 120 V. Use 3500 mAh 3.6V nominal NMC chemistry cell.

1.Design the battery pack configuration.

Given specifications of the car

Power = 150KW

Rated Voltage = 120V

Specifications of the Cell

Current = 3500mAh

Nominal Voltage = 3.6V

Chemistry – NMC

Let’s find the No. of Cells in series

No. of cells in series = Rated Voltage of Battery Pack/Nominal Voltage of Cell

No. of cells in series = 120/3.6 = 33.33

Now we have to round-off the No. of cells in series

Case-1 33 cells in series

33*3.6 = 118.8V

Case-2 34 cells in series

34*3.6 = 122.4V

We choose Case-2 As the Nominal Voltage of the Battery Pack is greater than the required system Voltage

No. of cells in series = 34

Parameters to be considered while selecting the BMS Topology

As the No. of cells in series are more than 18, I’m choosing Master & Slave Topology to design the BMS

As each AFE can read 18 cells No. of AFE’s (Slaves) are 34/18 = 1.8 =2

I’m distributing 17 cells per each AFE

Slave-1(AFE-1) = 1 to 17 Cells

Slave-2(AFE-2) = 17 to 34 Cells

2.Draw the BMS topology for this battery pack.

Master & Slave Topology BMS Architecture

Ship work like this
in your own course.