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Shield Ultracapacitor Strings From Overvoltage Yet

Maintain Efficiency

An ultracapacitor connected in series for greater terminal Voltage can suffer damage during charge due to individual cell overvoltage. This story describes the advantages and disadvantages of passive and active Voltage equalization methods to protect each cell in the string.(07-2BD76-13)

May 27, 2002, pp.81-85


T/J Technologies receives $2 million award from U.S. Dept. of Commerce to develop hybrid ultracapcitor/fuel cell power packs for portable electronics. The Company promises to alleviate two key frustrations for users of rechargeable batteries: limited run-time and access to a wall or vehicle outlet for recharging. The hybrid power packs are expected to deliver five times longer run time and be instantly rechargeable simply by refueling. (12-01 BD69-12)


(02-01-02 BD70-9) Ness Capacitor Co. introduces 2.7 Volt ultracapacitors. The company says it is the first ultracapacitor family with continuous operating Voltage rating higher than 2.5 Volts. The NESS 2.7 V ultracapacitor is said to have the highest capacitance and energy storage densities and the lowest Equivalent Series Resistance of any commercially available components of comparable size and weight. The key to performance is attributed to its porous carbon electrodes. Some targeted markets are for EVs and hybrid EVs acceleration and braking, industrial actuation and control, wind and fuel cell power conversion, and UPS switchover bridging.


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