Project 2 Thermal modeling of battery pack

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.

 in this model 1st we give UDDS current profile to battery pack with help of signal builder block.
 UDDS cycle (current vs time) has been used to charge discharge the batteries for given periode og time 1370 sec.
 there is three module hav been connected together in series to make a 10 cell battery pack model.
 in cell no.6 a resister can be added to vary the rate of discharge.
 all cell are configure same as ANR26650m1-B cell .it means put same value which in datasheet.
 all cell are iniially at 25 degree c.a temp.source is used to test the cell performance at 3 different atm.temperature,like At 25 o C,At 45 o C,At -10 o C .
 convective and conductive block hae been added for heat transfer between blocks.
vehicle Current Model:
 In vehicle current requirement subsystem block,the signal builder block used to apply UDDS current profile and simulink-ps converter block used to convert
the simulink signal to physical signal.connectin port block used to output the signal.

MATLAB Code:
clear all
close all
clc
f1 = xlsread(UDDS current profile (2).xlsx);
time = f1(:,1);
current= f1(:,2);
UDDS Current Profile in Signal Builder:

Module 1 [Cell 1-5]:

 In this module we used the 5 table based battery block in which we put the datasheet value on it.here i put the battery specification like, 2.5Ah capacity,initial
temp.value is 298K etc.and this 5 cell are connected in series.
 also here we use the conductive heat transfer block in which we put the thermal conductivity is 401 W/(K*m),area is 10 m^2,and thickness is 0.1m.
 here we use the convective heat transfer block in which we put the heat transfer co-efficients is 20 W/(K*m^2),area is 10 m^2.and one end of this block is
connected to thermal source and other is connected to perticular cell.
 here we use perfect insulator also.
 here we use temperature sensor to sense the temperature of cell and display the value in scope and dashboard.also it one end connected to thermal
referance.
 and SOC of every cell is also calculate by using add and gain block,and display the soc value in % in display block.

Module 2 [Cell 6]:

 In this module we used the table based battery block in which we put the datasheet value on it.here i put the battery specification like, 2.5Ah capacity,initial
temp.value is 298K etc.and addition to that accross the battery terminal we use the 5 ohms resistor to show the this is the faulty cell.
 also here we use the conductive heat transfer block in which we put the thermal conductivity is 401 W/(K*m),area is 10 m^2,and thickness is 0.1m.
 here we use the convective heat transfer block in which we put the heat transfer co-efficients is 20 W/(K*m^2),area is 50 m^2.and one end of this block is
connected to thermal source and other is connected to perticular cell.
 here we use perfect insulator also.
 here we use temperature sensor to sense the temperature of cell and display the value in scope and dashboard.also it one end connected to thermal
referance.
 and SOC of every cell is also calculate by using add and gain block,and display the soc value in % in display block.
Module 3 [Cell 7-10]:

 In this module we used the 4 table based battery block in which we put the datasheet value on it.here i put the battery specification like, 2.5Ah capacity,initial
temp.value is 298K etc.and this 4 cell are connected in series.
 also here we use the conductive heat transfer block in which we put the thermal conductivity is 401 W/(K*m),area is 10 m^2,and thickness is 0.1m.
 here we use the convective heat transfer block in which we put the heat transfer co-efficients is 20 W/(K*m^2),area is 10 m^2.and one end of this block is
connected to thermal source and other is connected to perticular cell.
 here we use perfect insulator also.
 here we use temperature sensor to sense the temperature of cell and display the value in scope and dashboard.also it one end connected to thermal
referance.
 and SOC of every cell is also calculate by using add and gain block,and display the soc value in % in display block.
SOC Calculation Model:
 here we use the 3 goto block and 3 from block and scope to analyze the change in soc of 3 different cell module.

Temperature Calculation Model:
 here we use the 3 goto block and 3 from block and scope to analyze the change in temperature of 3 different cell module.

To incorporate for the positioning of this cell(center of pack) certain changes have been made:

 the convective area is 10 m^2 for the remaining 9 cell,but has been increased to 50m^2 here.
 the ambient temperature provided from temperature source to the ramaining 9 cell are the same 298K,but has an increament of 7K for this cell.its means
305K.
Result:
A] At 25 o C:
1] SOC OF Different Module [%]:

 model 2 has a much steeper slope than the others bcoz of added 5 ohmc resistor.a load(in the form of resistor) with a resistance of just 5 ohms will draw in
more current compared to no added load.wich means greater rate of discharge and hence more drainage of SOC.
2] Temperature Change In Module [K]:

 Initial temperatre of batery pack is set to 298K.
 much steeper rise in temperature of module 2 compared to other module due to increased surface area contact and its position being in the center of the
battery pack.
 although ambient temperature supplied is 298K,module 2 reaches 305K (while the other cell are at 298K) for the aforementioned two reasons in addition to
the fact that there is also added 5ohms resistance in mode 2.
3] Dashboard for Indication of SOC and Temperature Change:

 both the gauge showing the change in SOC and change in Temperature.
B] At 45 o C:
1] SOC OF Different Module [%]:

 model 2 has a much steeper slope than the others bcoz of added 5 ohmc resistor.a load(in the form of resistor) with a resistance of just 5 ohms will draw in
more current compared to no added load.wich means greater rate of discharge and hence more drainage of SOC.
2] Temperature Change In Module [K]:

 Initial temperatre of batery pack is set to 298K.
 much steeper rise in temperature of module 2 compared to other module due to increased surface area contact and its position being in the center of the
battery pack.
 although ambient temperature supplied is 318K,module 2 reaches 325K (while the other cell are at 318K) for the aforementioned two reasons in addition to
the fact that there is also added 5ohms resistance in mode 2
3] Dashboard for Indication of SOC and Temperature Change:

 both the gauge showing the change in SOC and change in Temperature.
C] At -10 o C:
1] SOC OF Different Module [%]:

 model 2 has a much steeper slope than the others bcoz of added 5 ohmc resistor.a load(in the form of resistor) with a resistance of just 5 ohms will draw in
more current compared to no added load.wich means greater rate of discharge and hence more drainage of SOC.
2] Temperature Change In Module [K]:

 Initial temperatre of batery pack is set to 298K.
 much steeper fall in temperature of module 2 compared to other module due to increased surface area contact and its position being in the center of the
battery pack.
 although ambient temperature supplied is 263K,module 2 reaches 270K (while the other cell are at 263K) for the aforementioned two reasons in addition to
the fact that there is also added 5ohms resistance in mode 2
3] Dashboard for Indication of SOC and Temperature Change: