Supercapacitors have a wide range of applications. Combined with high energy density materials such as fuel cells, supercapacitors provide rapid energy release to meet the demand for high power, so that fuel cells can only be used as energy sources. At present, the energy density of supercapacitors can be as high as 20kW/kg, and they have begun to seize the market between traditional capacitors and batteries.

In applications that require high reliability but do not require high energy, supercapacitors can be used to replace traditional batteries, or they can be combined with batteries, Super capacitor module It can be used in occasions with high requirements for energy, and smaller and more economical batteries can be used.

Any supercapacitor will discharge through internal parallel resistance when it is powered on. This discharge current is called leakage current, which affects the self discharge of supercapacitor unit. Similar to some secondary battery technologies, the voltage of supercapacitor also needs to be balanced when used in series, because Farad capacitor There is leakage current, and the internal parallel resistance determines the voltage distribution on the series connected supercapacitor unit. When the voltage of the supercapacitor is stable, the voltage of each unit will change with the leakage current, not with the capacitance.

The discharge of the supercapacitor unit will reduce the voltage, which will then affect the voltage of other units connected in series with it. It is assumed that these connected units use the same constant voltage for power supply.

Super capacitor manufacturer In order to compensate for the leakage current change, a common method is to connect a resistor beside each unit to control the leakage current of the whole unit. This method effectively reduces the variation of the corresponding parallel resistance between the units.