Battery vs Supercap

Ultracap-Knowledge | Rainer Hake | reading time: 1 minute

The advantages of supercapacitors compared to batteries

ULTRACAPS / Supercapacitors are an important element in energy storage today and are characterized by excellent properties, such as

  • high cycle stability (>1,000,000)
  • high life expectancy (>10 years)
  • wide temperature range (-40 to +70 degrees)
  • high power density (fast charge/discharge capability, 10,000 W/kg)
  • high energy efficiency (>0.95)
  • high vibration resistance
  • high acceleration forces
  • maintenance-free and
  • environmentally friendly materials.

Economically viable use depends on many factors and must be examined on a case-by-case basis. The quickest way to help is a direct comparison based on the following performance parameters.

Battery and Ultracap (Supercap) characteristics

  Ultracap Battery
Energy storage physical chemical
Discharge time 1s - 30s 0,3h - 3h
Charging time 1s - 30s 1h - 5h
Energy density (Wh/kg) 1 - 10 20 - 100
Power density (W/kg) 10.000 50 - 200
Charge/discharge efficiency 0,90 - 0,97 0,70 - 0,90
Charge/discharge cycle > 1.000.0000 500 - 2500
Ambient temperature -40 bis +70 0 - 60

Energy density of ultracaps
- important value for comparison with accumulators

Chart: Energydensity (Wh/kg) / Power density (W/kg) of batteries and capacitors


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Why are components like ultracaps called different names?

The variety of terms is explained by the English-language terms commonly used in the electronics industry, which are often mixed with German terms or used synonymously. In some cases, manufacturers have also introduced artificial terms to better distinguish themselves from competitors. Here are the most important examples:

Double layer capacitors (DSK) are referred to synonymously as:

  • EDLC (Electric Double Layer Capacitor)
  • Supercapacitors = Supercaps
  • Ultracapacitors = Ultracaps
  • Goldcap™ [Panasonic]
  • Boostcap™  [Maxwell]
  • Greencap™  [Samwha]
  • PURIXEL™  [Pureechem] for supercap cells
  • PURETRON™  [Pureechem] for supercap modules

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