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.

Solution:

Now a days lithium ion battery are mostly used in electric vehicles we must know its charge and discharge rates to operate this batterys in efficient manner and with out damage when this batterys in operation this temperature of it must be kept in limit we simulate the thermal effect of this cell , by knowing the how much temp rise take place we can provide efficient cooling to the batterys so that the life cycle of the battery increases we will see a model on this issue below and explaination as follows

cells connected in series and one of the cell is faulty so what will be thermal effect . This example shows how to simulate a battery pack consisting of multiple series-connected cells in an efficient manner. It also shows how a fault can be introduced into one of the cells to see the impact on battery performance and cell temperatures. For efficiency, identical series-connected cells are not just simply modeled by connecting cell models in series. Instead a single cell is used, and the terminal voltage scaled up by the number of cells. The fault is represented by changing the parameters for the Cell 10 Fault subsystem, reducing both capacity and open-circuit voltage, and increasing the resistance values.

The above model shows the simulation of the thermal effect of 10 cells connected series in the circuit. The cells used here are each 50Ah with the total capacity of 500Ah battery is formed by connecting 10 batteries in series. The battery temperature port is connected to the temperature sensor so the temperature of each cell battery is sensed and viewed in the scope and parallely the temperature port is connected to the out ambient temperature. The state of charge of the battery pack is counted by the Coulomb method ,that is done by the integration of charge after counting is calculated with the past value and displayed in the scope. The draining current from the battery pack is controlled by the controlled current source, that is controlled by the constant block.

We will take temperature at three condition.

1. 20

2. 40

3. 100

1. In the above block daigram we take temperature as 20.

Scope:

2. In the above block daigram we take temperature as 40.

Scope:

3. In the above block daigram we take temperature as 100.

Scope:

Conclusion:

Thus the thermal effects for a 10 cell series lithium ion battery model is simulated and the result is plotted above.

Please find below attached files for your reference.