Project 2 Thermal modeling of battery pack

Question 1: 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.

Solution 1: Simulation for 10 lithium ion battery connected in series without thermal effect is done in MATLAB 2020a.

Parameter for lithium ion battery:

Simulation Result:

We can see from simulation result that when the C-rate is 1C i.e battery charges completely and discharges completely to complete one life cycle. As we can see it from figure shown below after one complete charge and discharge cycle battery life reduces.

Temperature effect on battery life:

In second case thermal effect is taken in account i.e. at 25^oC temperature simulation is done to obtain the result.

Simulation Result:

We can see that the effect of temperature on battery pack is significant. The voltage level of battery pack reduces as compared to 1^st case. Even the life cycle of battery pack also changes.

Change in Charge and Discharge Cycle

As the Charge and discharge cycle of battery is changed to 2C-rate the life cycle reduces faster as compared to 1^st and 2^nd case. The temperature also increase and battery performer reduces.

Table based battery model of 10 series battery:

10 Table based battery is connected in series as shown below in the figure. A different approach has be considered to obtain the thermal effect and SOC of battery pack

The subsystem of battery pack is shown below:

A temperature measurement system is connected to the battery to obtain the thermal effect. A UDDS drive cycle as current is given to controlled current source.

Temperature measurement of battery:

On running the simulation for 3600 sec we see from the result that the temperature rise and SOC reduces.