ABSTRACT
A select number of manufacturers have expanded their offerings to include 3 V electrical double-layer capacitors (EDLC), augmenting their existing 2.7 V lines. These newly developed products are designed to have a more extensive lifespan, incorporating innovative features that can withstand harsh conditions like high humidity, while maintaining minimal losses across a broad temperature range.
EDLCs have been experiencing remarkable growth over the past few years. These devices serve as high capacity rechargeable energy storage systems, distinguished by their ability to swiftly charge and discharge cycles. Owing to their exceptionally low internal resistance (ESR), EDLCs are capable of delivering and absorbing high peak power, making them perfectly suited for booster applications. They also maintain consistent capacity and storage capabilities across varying temperatures.
One of the standout features of EDLC products is their potential to undergo limitless charge and discharge cycles, extending the operational lifespan of battery systems. In some instances, they can reduce or even eliminate the need for a battery in certain applications, making them a valuable asset in backup, energy harvesting, and self-powered IoT applications.
EDLCs have a competitive edge over batteries, as they can be charged considerably quicker. The introduction of 3 V EDLC products has further enhanced this advantage, as they can store 20 % more energy than a comparable 2.7 V system of the same dimensions. Furthermore, the larger voltage window of these 3 V components can prolong device life, save space, and reduce costs on the PCB.
The current line of 3 V Vishay products has been designed to directly replace the older 2.7 V versions, promising a two to three times longer service life.
GENERAL EDLC TECHNOLOGY OVERVIEW
Vishay’s electrical double-layer capacitors (EDLC) are quintessential supercapacitors featuring a radial design. Even in this configuration, an EDLC is capable of achieving extremely high capacitance values, reaching up to 100 F. This technology bridges the gap between traditional aluminum electrolytic capacitors and rechargeable batteries.
Supercapacitors can store considerably more energy than conventional aluminum capacitors. Another key advantage is their ability to produce high discharge currents, which sets them apart from rechargeable batteries. Furthermore, EDLCs can withstand an impressive number of charge and discharge cycles, exceeding one million in count.
EDLCs have found applications in various areas such as backup power supplies, burst power support, and energy harvesting storage devices. They are also utilized in micro-UPS systems and energy recovery mechanisms.
