Thermal Modelling (Electrical) Of 10 Cells Connected In Series || MATLAB || Simulink
OBJECTIVE:
To Compare life cycle performance at various temperatures, Charge & Discharge rates of a 10 cell series lithium ion battery model.
THEORY:
BATTERY: A container consisting of one or more cells, in which chemical energy is converted into electricity and used as a source of power.
AMBIENT TEMPERATURE: Ambient temperature is the air temperature of any object or environment where equipment is stored.
CONDUCTIVE HEAT TRANSFER: Conduction heat transfer is the transfer of heat by means of molecular excitement within a material without bulk motion of the matter. Conduction heat transfer in gases and liquids is due to the collisions and diffusion of the molecules during their random motion.
CONVECTIVE HEAT TRANSFER: Convective heat transfer, often referred to simply as convection, is the transfer of heat from one place to another by the movement of fluids. Convection is usually the dominant form of heat transfer in liquids and gases.
THERMAL SENSOR: A temperature sensor is an electronic device that measures the temperature of its environment and converts the input data into electronic data to record, monitor, or signal temperature changes.
VOLTAGE SENSOR: A voltage sensor is a sensor is used to calculate and monitor the amount of voltage in an object. Voltage sensors can determine both the AC voltage or DC voltage level. The input of this sensor can be the voltage whereas the output is the switches, analog voltage signal, a current signal, an audible signal, etc.
CURRENT SENSOR: A current sensor is a device that detects electric current in a wire and generates a signal proportional to that current. The generated signal could be analog voltage or current or even a digital output.
MODEL STUDY:
Model_1 : Main Model
Let us now, Go through some of the important parts in the model and there use in our model.
# TEMPERATURE SOURCE:
>>Temperature Source<<
This block represents an ideal energy source in a thermal network that can maintain a constant absolute temperature at the port regardless of the heat flow rate.
# CONVECTIVE HEAT TRANSFER:
>>Convective Heat Transfer<<
This block represents an ideal energy source in a thermal network that can maintain a constant absolute temperature at the port regardless of the heat flow rate.
# CONDUCTIVE HEAT TRANSFER:
>>Conductive Heat Transfer<<
This block models heat transfer in a thermal network by conduction through a layer of material. The rate of heat transfer is governed by Fourier's law and is proportional to the temperature difference, material thermal conductivity, area normal to the heat flow direction, and inversely proportional to the layer thickness.
# TEMPERATURE SENSOR:
>>Temperature Sensor<<
This block measures temperature is a thermal network. There is no heat flow through the sensor. The physical signal port T reports the temperature difference across the sensor. The measurement is positive when the temperature at port A is greater than the temperature at port B.
Let us now, look at the parameters of the Blocks.
BLOCK PARAMETERS:
# BATTERY:
Lithium Cell
# VALUES:
Capacity_LUT 
Em_LUT 
R0_LUT
R1_LUT
C1_LUT
SOC_LUT
Temperature_LUT
*Please Note Do check out the Block parameter for Units
*Again, For single cell. We increased the resistance by change the values in Electrical parameters and number of cells.
# DRIVE CYLCE:
Drive Cycle
# VALUES During Discharge & Charge:
Current Values for OWN_Drive_Cycle During Discharge
Current Values for OWN_Drive_Cycle During Charge
# CONDUCTIVE CELL 05 - 06 & VALUES:
# CONVECTIVE AMBIENT- CELL 01-05 & VALUES:
*Please Note that, for different number of cell taken into action. The value of area will vary.
Example: for single cell 6 area = cell_area *1 and vice versa.
# AMBIENT TEMPERATURES & VALUES :
# VARIATION IN TEMPERATURES :
Temp. Ref. Point In deg. Celsius In Kelvin
RESULTS :
DURING DISCHARGE & CHARGE:
At, Hot Days of 303 K Ambient Value
At, Sweltering Days of 313 K Ambient Value
At, Body Temperature of 310.2 K Ambient Value
At, Boling Pont Of Water 373 K Ambient Value
* Taking Simulation time as 7200 sec.