ULTRACAPACITOR

SEMINAR 2012-2013NAME

Reg No: XXXXXX

INTRODUCTION• This is the newly available technology, balance the use of both energy

and power.

• It is an electro chemical capacitor with relatively high energy density.

• In conventional capacitor, energy is stored by the removal of charge carriers.

• In EDLC, energy stored in carbon pores.

• Exhibits high capacitance.

• Used in finite range of energy and power requirements.

ATTRACTIVE FEATURES

• Capacitance range up to 5000f

• No chemical reaction involved.

• Much more effective at rapid , regenerative energy storage than chemical batteries.

• Works even at low temperature ,-40 degrees celsius.

• Can effectively fulfill the requirement of high current pulses that can kill a battery if used insead.

CONSTRUCTION

WORKING

WORKING• When a voltage is applied, the ions are attracted to the

electrode with +ve charge , Where they cling to the pores in the carbon.

• Carbon does not react chemically with the ions.

• As the effective area much larger , High Capacitance obtained.

EDLC Vs BATTERIES

• Degrade within a few thousand charge-discharge cycle. Capacitor can have more than 300 000 charging cycles, which is far more than a battery can handle.

• Ultracapacitor charges within seconds where as batteries takes hrs.

• More effective at rapid, regenerative energy storage chemical batteries are.

• Batteries fail where high charging discharging takes place where as ultra capacitor fare extremely well.

EDLC Vs ORDINARY CAPACITORS

• Higher capacitance

• Same size capacitors charged to 1.5v EDLC light the bulb for 2 minutes.

• EDLC are expensive.

PROPERTIES

• Capacitance – Several thousands of farads.Up to 5000F

• Specific Energy – 0.5 to 30 Wh/kg.

• Power Density – 10 to 100 times greater than rechargeable battery.

• Self Discharge – Faster than electrolytic capacitor.

• Voltage – Maximum working voltage about 5V.

ADVANTAGES• Long life

• Low cost per cycle

• Good reversibility.

• Very high rate of charge and discharge.

• Low internal resistance & low heating level.

• High out put power.

• High specific power.

• Improved safety. No corrosive electrolyte and toxic materials.

• Simple charge methods. No danger of overcharging.

DISADVANTAGES

• Energy stored per unit weight is lower than that of an electrochemical battery.

• High rate of self discharge.

• Low maximum voltage.

• Effective storage and recovery of energy requires complex electronic control and switching equipment.

• Extremely rapid discharge when shorted.

APPLICATIONS

• Heavy and public transport- Starting diesel trucks,train,etc.

• Complementing Batteries.

• Consumer electronics.

• Military projects- For example, starting the engine of battle tanks and replacing the batteries in missiles.

CONCLUSION

• Ultra capacitors have many advantages over traditional electrochemical batteries.

THANK YOU