Project 2 Thermal modeling of battery pack

AIM:For a 10 cell series lithium ion battery model, simulate the thermal effects and compare life cycle performance at various temperatures, charge & discharge rates using MATLAB.

objective:

to analyze temperature and life cycle parameters of the 10 cell series battery pack

1. connect 10 cells in series analyze the response to a cyclic charge and discharge sourve
2. change the ambient temperatures of the battery pack and compare the performance
3. add the fading parameters of the battery and analyze the performance after each cahrge/discharge cycles.

battery modelling procedure followed by matlab:

equivalent  circuit modeling is the most common approach for battery numerical analysis .for lithuim cells,a one or two Rc BLOCK MODEL with no parasitic branch is a common choice

                                                                      

                                                                            

circuit construction & working:

                                             

cell 01 to 04 subsystem:

                                                       

lithium cell 1RC subsystem:

                                                                   

                                                                            

TEMPERATURE SENSOR:

                 

THE temperature sensor block representes an ideal temperature sensor block represents an ideal temperature sensor.that is a device that determines the temperature differential measured between two points without drawing any heat

convective heat transfer:

                             

this block models heat transfer in a thermal network by convection due to fluid motion .the rate of heat tranfer is proportional to the temperature difference,heat transfer coefficient and a surface are in contact with fluid.

results:

1)results AT  300k ie 26.85c

                                     

                                       

2)results at 310 k ie 36.85c

                                      

                                        

3)results at 324k ie 50.85c

                                   

                                      

conclusion:

matlab library model parameters were evaluated for its life cycle and thermal effects parameters. a battery pack with 10 cells connected in series also made with a source of charging and discharging cycle.