Project 2 Thermal modeling of battery pack

Battery Pack,

A battery pack is a set of any number of (preferably) identical batteries or individual battery cells. They may be configured in a series, parallel or a mixture of both to deliver the desired voltage, capacity, or power density.

10 Series connection,

The 10 series battery configuration of the li-on battery pack,these are all battery cell connected in series.this battery pack charge or discharge by using the controlled current source .for this cell enable the temperature effect and estimateing the temperature and signal effect.

so the model estimate the soc of the battery pack,battery pack temperature,ambient temperature,battery pack current by using the bus selector from any one cell of the battery pack,because the battery pack made frome connecting cells in series.so current,soc,is similar to other cell.

The battery pack voltage is calculated by using voltage measurement block,all positive terminal connected to the positive terminal of voltage measurement block, and all negative terminal connected to the negative terminal of voltage measurement block

Controlled Current Source,

The Controlled Current Source block converts the Simulink input signal into an equivalent current source. The generated current is driven by the input signal of the block. The positive current direction is as shown by the arrow in the block icon.

Generic Battery,

The battery block implements a generic battery that represents most popular typesof rechargable battery,for thes module enable the temperature effects .

Result,

so this simulink module simulates multiple times at different ambient temperature and different charging & discharging current rate.ambient temperature can changed by ambient constant block.

If ambient temp is 25,

if the ambient temp is 25,soc constant upto 20 sec after gradually reduced to 99.1,voltage also decrease by some different different reduces and increases,The cell tepm gradualy increase to 20C - 20.5C.

If ambient temp is 50,

if the ambient temp is 50,soc constant upto 20 sec after gradually reduced to 99.1,voltage also decrease by some different different reduces and increases,The cell tepm gradualy increase to 20C - 22.58C.

If ambient temp is 75,

if the ambient temp is 75,soc constant upto 20 sec after gradually reduced to 99.1,voltage also decrease by some different different reduces and increases,The cell tepm gradualy increase to 20C - 25.1C

Conclusion,

When the ambient temperature increase then obviously cell temp is increase also the ambient temp adverse effect reflects on the battery pack.

similarly we decrease the C rate its shows the favourable and unfavourable effects on the soc,temp,and voltage of the battery pack.

The age of battery increase slowly,soc not able to charging and discharging completely,cell temp is less and in the votage spikes are present.