Powerelectronics 1476 Boostcapultracap

C-Cell Ultracaps Offer New Options for Packaging, Performance, and Cost

June 14, 2006
With the introduction of its C-cell ultracapacitors, Maxwell Technologies once again exploits a popular battery package — this time to reduce cost versus performance for components in the 100-F range.

With the introduction of its C-cell ultracapacitors, Maxwell Technologies once again exploits a popular battery package—this time to reduce cost versus performance for components in the 100-F range. The new ultra-caps use the same proprietary electrode material applied in the previously introduced D-cell ultracapacitors. However, the smaller C-cells also offer designers the option of selecting cells that have been optimized for either power delivery or energy storage (see the figure below).

The BCAP0120 P250 is a 120-F power-type C-cell engineered specifically for high-cycling applications that require the lowest ESR and highest efficiency. This ultracap features a power density of 21.5 kW/kg. Other specifications include an ESR of 5.0 Ω and a time constant of 0.6 sec.

The BCAP0140 E250 is a 140-F energy version designed to provide more economical solutions for lighter duty applications. This ultracap provides an energy density of 4.4 Wh/kg and a power density of 14.9 kW/kg. Meanwhile, the ESR of this part is 7.2 Ω and its time constant is 1.0 sec.

Both the power and energy models are also available in a fully integrated six-cell, 15-V pack. The C-Cell ultracapacitor cells and multi-cell packs provide high-performance, "life-of-the system" alternatives to batteries for a range of industrial and transportation applications. These include industrial robotics, actuators, telecom power buffering and back-up, aircraft door and air bag actuation, distributed power nodes for automotive subsystems and solar energy system augmentation.

These 2.5-V cells have the same external dimensions but one-third the weight (29 g) of the familiar C-size battery. Moreover, the cells are designed for easy mounting on PCBs and in other electrical devices and systems.

In developing the C-Cells, Maxwell Technologies aimed to replace its PC100E series ultracaps with lower-cost models. The cost reduction is made possible in part by the use of the company’s carbon-powder-based electrode, which enables better performance-versus-cost than the carbon cloth material electrode employed in the PC100E. The C-Cells are said to offer a 4- to 5-times reduction in cost per Farad versus the PC100E series.

The C-cell ultracapacitors are currently undergoing UL testing and UL approval is anticipated in the next few months. For more information, see www.maxwell.com.

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!