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Field: On-board vehicle propulsion system
Type: Electric energy storage element
Application: Hybrid and Electric vehicles (BMW, partnership with Pininfarina)
Manufacturer / Innovator: batScap (the Bolloré Group)
Key Person(s): Vincent Bollore
Overview
Supercapacitors can store a lot of energy while providing substantial power—answering both benefits found in typical capacitors and batteries. Unlike batteries, Supercapacitors charge without a chemical reaction; rather they store energy as a charge of electrons on a material’s surface. batScap’s 2.7 volt rated supercapacitor cell is going into mass production this January 2008 and as a supercapacitor it claims a higher specific power than batteries, with a longer potential lifetime and a high power efficiency. BatScap believes its supercapacitors can reach energy storage efficiencies higher than 95%
In the proposed vehicle venture between Bollore and Pininfarina, a full supercapacitor module rated at 50 volts will work in conjunction with the company’s Lithium Metal Polymer battery.
Breakthroughs
• The supercapacitor will suffer none of the faradaic oxidation of reduction seen in batteries
• It is superior to current battery systems in terms of capturing heat during regenerative braking.
• It can stabilize the onboard power supply voltage, and offer assistance to the battery when electrical power is being drawn off, while contributing additional power during acceleration.
• Can power the vehicle’s electrical system and start the heat engine when the brake pedal is lifted
Conclusion
Supercapacitors show tremendous benefits versus current PHEV and EV battery systems because they feature super-quick charge times and temperature stability, and its properties are substantially safer than batteries.
Revenant specs for the 2600 F cell:
Rated Capacitance (25°C, 100A): 2600 F
Rated Voltage 2.7 V
Series Resistance DC (25°C, 100A) 0.35 mOhm
Series Resistance AC (25°C, 100 A) 0.2 mOhm
Maximum peak current 600 A
Weight 500 g
Spec Energy at 2,7 V, 25°C 5.3 Wh/kg
Spec Power (matched load at 2,7V, 25°C 18 KW/kg
Time constant RSDCC (25°C, 100A) 0.9 s
Operating Temperature -30 to +60 °C
Storage Temperature -30 to +70 °
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