Precautions for Using Multiple Connected Supercapacitors
When connecting supercapacitors in series, insert a voltage balancing circuit in parallel with the supercapacitors to suppress voltage imbalance among them.However, a certain amount of voltage spread will occur even with a voltage balancing circuit in place. So this should be taken into account and a sufficient amount of margin included.
If nothing is done to balance voltage, the variation in characteristics between supercapacitors may cause them to become unbalanced, and result in some cells experiencing voltages in excess of their rated voltage.
[Fig. 1] Example of voltage balancing circuit
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