Project 5
Project 5 Battery pack
Aim
. To create is 10 cell series lothium ion battery model
. To simulate the thermal effect and compare life cycle performance at various tempreature , Charge and discharge rate using matlab
Theory and explanation :
Battery pack
A battery pack is a set of any number of identical individual cell. theey may be configured in a series parllel or a maximum of both to deliverd the desired voltage capacity or power density rechargeable battery pack often contain a temperature sensor which the battery charge use to detect the end of chaarging interconnect are also found in batteri9es as the are the parrt which connect each cell as per our requirement battery connect configuratin mode . If we want more voltage than the indivisible one cell than series connection is made and if we want more current capacity then connect cell in parllel manner . And it look similar to the figure
Simulation result:
We can see from simulation result that when the c rate is IC battery charge completely aand discharge completely to complete one life cycle . As we can see it from figure shown bleow after one complete charge and discharge cycle battery life reduce
The above figure shoun 10 series coonfiguration of the lithium ion battery pack . THese are all battery cell connected in series . The battery pack charge or discharge by useing the controlled aurrent source and square wave genrater . For this cell this cell enable the temnprature effect and againg option for observing and estimate the tempreature and sgnal effect So in this model i can estimate the age of the cell SOC of the battery pack battery pack tempratuer ambient temperaature battery pack current is made by the useeing a bus selector from any one cell of the battery pack because this bettrey pack is madee from connnecting the cell in series . So nurrent temperature Soc and age of the cell is similar to other cell . The battery pack voltage is calculate by useing a voltage mesurement block and this measurement block is connected accross the battery pack . first cell positive terminal connect to the nigative teerminal of voltage mesurement block also by sing constant block it provides ambient teempreatuer to all cells .
Conclusion :
. When ambient temperature increses then obvisously cell temperature is incresesed also this ambient temperratture advverse effect rreflect on the age of the battery pack and vice versa
. similar when we decresseed cv rate than it show favorable and unffavoraable effect on the age SOC temperature and voltage of the battery pack .
. The age of the battery increses sloly . SOC not cable to charge or discharge completely cell temperature is less and in the voltage spiukey are present