Maxwell 2.85 w DuraBlue cell

Maxwell 2.85 w DuraBlue cell

Maxwell Technologies recently introduced its K2 2.85V/3400F ultracapacitor, which can provide 17% more power and 23% more energy than Maxwell's previous model, or so the company claims.

Features & Benefits

  • Up to 1,000,000 duty cycles or 10 year DC life*
  • Highest power and energy
  • Up to 18 kW/kg of Specific Power
  • Up to 4.00 Wh of Stored Energy
  • Threaded terminals or laser-weldable posts

18 kW in 0.5 kg is something hard to imagine.  However, energy density is at the level of just 7.7 Wh / kg (approx. one fourth of lead acid batteries).

This is still out of range for EV needs, because the main task is to raise energy density and lower the price, but for hybrid or plug-in hybrid vehicles this could bring some improvements. Maxwell Technologie says that in hybrid buses in which the ultracapacitors were used, fuel consumption can be lowered by 20-30%.

Second is that this new ultracapacitors will be more reliable due to higher vibrational resistance and shock immunity.

"The new 2.85-volt, 3400-farad ultracapacitor cell increases the range of available specific power and stored energy in the industry-standard 60 mm cylindrical "K2" form factor, and introduces DuraBlue Shock and Vibration Technology, the newest innovation in ultracapacitor reliability and performance. DuraBlue Technology is tested to some of the most demanding environmental requirements for transportation, increasing vibration resistance by approximately 300 percent and shock immunity by 400 percent when compared with ultracapacitor-based competitive offerings."

James Hines, research director of Gartner, wrote:

"The high costs and adverse environmental impacts of consuming petroleum-based fuels are driving development of alternative fuels and higher efficiency automotive powertrains. These systems require a source of electrical energy, and batteries have been widely used for energy storage in these applications; however, while batteries can store relatively large amounts of energy over a long time period, they are limited in their ability to deliver high power to a load. Ultracapacitors are capable of releasing electrical energy at high power levels, and they can accept a high rate of charge, making them an ideal complement to batteries in high-power applications."1

1 Gartner, Cool Vendors in Automotive Electronics, 2014, James Hines, April 29, 2014.

Franz Fink, Maxwell's chief executive officer, stated:

"This latest addition to our widely popular K2 Series of ultracapacitor cells reflects Maxwell's commitment to continuous customer-driven innovation, and delivers superior performance with unmatched reliability and value. Our new DuraBlue Advanced Shock and Vibration Technology combines Maxwell's unique and patented dry electrode formation and manufacturing process with a robust proprietary cell structure design to meet or exceed the most demanding shock and vibration requirements of the growing number of power-hungry applications in global transportation markets."

Datasheet of K2 2.85V/3400F can be found here.