Project 2 Thermal modeling of battery pack

Q)

Ans:-

A123’s high-performance Nanophosphate® lithium iron phosphate (LiFePO4) battery technology delivers high power and energy density combined with excellent safety performance and extensive life cycling in a lighter weight, more compact package. Our cells have low capacity loss and impedance growth over time as well as high usable energy over a wide state of charge (SOC) range, allowing our systems to meet end-of-life power and energy requirements with minimal pack oversizing.

Commercial Solutions:

Advanced lead acid replacement batteries for:

• Datacenter UPS
• Telecom backup
• IT backup
• Autonomously guided vehicle (AGV's)
• Industrial robotics and material handling equipment
• Medical devices

Government Solutions:

• Military vehicles
• Military power grids
• Soldier power
• Directed energy

Grid Solutions:

• Frequency regulation
• Renewables integration
• Reserve capacity
• Transmission and Distribution

Transportaion Solutions:

• Commercial vehicles
• Off-highway vehicles
• Passenger vehicles

Cell Dimensions	26*65 mm
Cell Weight	76g
Cell Capacity (nominal/minimum) (0.5C Rate)	2.5/2.4 Ah
Voltage (nominal)	3.3 V
Internal Impedance (1kHz AC typical)	6 mohm
Power	2600 W/ kg
Recommended Standard Charge Method	2.5A to 3.6V, 60 mi
Recommended Fast Charge Method to 80% SOC	10A to 3.6V CC, 12 min
Maximum Continuous Discharge	50A
Maximum Pulse Discharge (10 seconds)	120A
Cycle Life at 20A Discharge, 100% DOD	>1,000 cycles
Operating Temperature	-30 degree celcius to 55 degree celcius
Storage Temperature	-40 degree celcius to 60 degree celcius

• In this module we used the 5 table based battery block in 2 subsystem 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.
• We have connected a signal buider as the input to the circuit in which the time range and the value is been inserted by referring the week 4 challenge values.
• gain block is been connected to get the value of the whole input into single output.

For subsystem 2:-

Result :- At temperature 298 degree K we get the output with SOC 1 to 0.998

At temperature 305 degree K we get