Supercapacitor capacitance values may differ as much as ☒0% (total of 40%) from cell to cell. The factor that initially dominates imbalance is the capacitance difference between cells - a cell with a lower capacitance will charge to a higher voltage in a series string. Otherwise the supercapacitor could degrade from electrolyte decomposition, gas generation, or a rising effective series resistance (ESR). It is important to keep the voltage on any single cell below its maximum recommended working voltage. These differences create an imbalance in the cell voltages of supercapacitor wired in series. ![]() Unfortunately, supercapacitors may have a tolerance difference in capacitance, resistance and leakage current. For many applications a voltage this low isn’t particularly useful, so the common practice is to place multiple supercapacitor in series. The average supercapacitor has a maximum charging voltage of between 2.5 and 2.7 V. ![]() ![]() Robert Chao | Advanced Linear Devices Inc. Here are the tricks involved in stringing these components together. The low voltage available from a single supercapacitor forces most applications to use several supercaps in series.
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