Control the discharge of supercapacitor:

The resistance of supercapacitor hinders its fast discharge, and the time constant of supercapacitor τ In 1~2s, it takes about 5% to discharge the resistance capacitance circuit completely τ， That is to say, if the short circuit discharge takes about 5~10s (because of the special structure of the electrode, it actually takes several hours to completely discharge the residual charge).

Control time of discharge:

Supercapacitors can charge and discharge quickly, and the peak current is only restricted by its internal resistance, even short circuit is not fatal. In fact, it depends on the size of the individual capacitor. For matching load, the small unit can put 10A, and the large unit can put 1000A. Another restriction of the discharge rate is heat. Repeated discharge at a violent rate will raise the temperature of the capacitor, which will lead to an open circuit.

Modification during application

Farad capacitor It has fixed polarity. The polarity shall be confirmed before use.

It shall be applied at nominal voltage. When the capacitor voltage exceeds the nominal voltage, it will lead to electrolyte differentiation. One capacitor will heat up, its capacity will decline, and the internal resistance will be added, which will shorten its life. In some cases, it may lead to the collapse of the capacitor function.

After the farad capacitor is installed, do not forcibly skew or twist the capacitor. Otherwise, the capacitor leads will become loose, leading to functional degradation.

Super capacitor manufacturer After the capacitor is welded, the circuit board and capacitor need to be cleaned. Because some impurities may cause capacitor short circuit.

Do not stay in a place where the relative humidity is greater than 85% or contains toxic gas. Under these circumstances, lead wires and capacitor shells will be corroded, resulting in open circuit.

It shall not be placed in the environment of high temperature and humidity. It should be stored in an environment with a temperature of - 30+50 ℃ and a relative humidity of less than 60% to avoid sudden rise and drop of temperature, otherwise it will cause damage.

When used on the double-sided circuit board, the connection shall not be accessible through the capacitor. Because the installation method of supercapacitor will lead to short circuit.

When welding the capacitor on the circuit board, do not contact the capacitor housing with the circuit board. Otherwise, the weldment will penetrate into the capacitor threading hole, which will affect the function of the capacitor.

Use capacitors in series. Due to process reasons, the rated operating voltage of unipolar supercapacitors is generally about 2.8V, so they must be used in series in most cases, because it is difficult to ensure that the capacity of each individual in the series circuit is the same, and it is also difficult to ensure that each individual leakage is the same, which will lead to different charging voltages of each individual in the series circuit, which may lead to overvoltage damage of the capacitors. Therefore, The series connection of supercapacitors must be equipped with a voltage sharing circuit. When supercapacitors are used in series, there is a problem of voltage balance between individual capacitors. Simple series connection will lead to overvoltage of one or several individual capacitors, and then damage these capacitors, affecting the overall function. Therefore, when capacitors are used in series, technical support from the manufacturer is required.

The external ambient temperature has an important influence on the service life. Super capacitor module Keep away from heat sources as far as possible.

Voltage drop when used as backup power supply. Because the super capacitor has a large internal resistance, there is a voltage drop at the moment of discharge Δ V=IR。