Oct 14, 2024 · The electric double layer capacitors are used in pulse technology devices, as electric energy storage devices, for starter firing, for the recuperating of the braking energy of
The electric double layer capacitors are subdivided into the power electric double layer capacitors and the energy ones. The power (pulse) electric double layer capacitors have a high specific power (up to hundreds of kW/kg), whereas the energy electric double layer capacitors have a high specific energy (~25 W h/kg and higher).
Compared to batteries, the power electric double layer capacitors have a much higher power density and better cyclability—up to hundreds of thousands and millions of cycles. Publications on the electric double layer capacitors’ self-discharge are reviewed.
Self-discharge of double layer capacitors is characterized via the "Voltage Holding Characteristic" as shown on specification sheets, and specifies the minimum voltage after 24 hours at room temperature after the part has been charged for 24 hours at the rated voltage.
Application of a voltage exceeding the maximum operating voltage may deteriorate performance and damage the component. Double layer capacitors are polarized (anode + terminal and cathode – terminal). Please assure correct polarity when installing (or placing) component during PCB assembly.
For series connection of multiple double layer capacitors, please take measures to ensure voltage is evenly distributed to all capacitors and the voltage applied to each capacitor does not exceed the maximum operating voltage (VDC). All radial leaded versions of double layer capacitors cannot withstand exposure to reflow soldering heat.
Equivalent Series Resistance (ESR): ESR of double layer capacitors is relatively high. Do not use double layer capacitors in supply voltage smoothing circuits, such as output filter of power supply circuits
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