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Double-layer farad capacitance

Double-layer farad capacitance

  • Cname:Farah capacitance
  • Views:Times
  • Release date:2023-02-28 11:43:22
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Product introduction:

        The double-layer Faraday capacitance is generated by the charge confrontation caused by the directional arrangement of electrons or ions at the electrode/solution interface. For an electrode/solution system, a double electric layer will be formed at the interface between the electron-conducting electrode and the ionic conducting electrolyte solution. When an electric field is applied to the two electrodes, the anions and cations in the solution migrate to the positive and negative electrodes respectively, forming a double electric layer on the surface of the electrode; After removing the electric field, the positive and negative charges on the electrode attract the opposite charge ions in the solution, which makes the double electric layer stable, and generates a relatively stable potential difference between the positive and negative electrodes. At this time, for a certain electrode, it will generate the same amount of anisotropic ionic charge as the charge on the electrode within a certain distance (the dispersion layer) to keep it neutral; When the two poles are connected to the external circuit, the charge on the electrode migrates to generate current in the external circuit, and the ions in the solution migrate to the solution to be electrically neutral, which is the charge and discharge principle of the double-layer capacitor.

Product Specifications:


Rated voltage V 

Capacity F

Internal resistance Ω1KHz

24h leakage current uA

Product Size

Diameter D±0.5 (mm)

Length H±0.5 (mm)

Pitch ±0.5 (mm)


Product size:

Product display:

5.5V5.F V1.jpg


Product use:


Product packaging:


Product application scope:

       The pulse power performance, long service life and reliable operation in extreme temperature environment of supercapacitors are fully suitable for those applications requiring repetitive electric energy pulses in a fraction of a second to a few minutes, making them energy storage and power transmission solutions for transportation, renewable energy, industrial and consumer electronics and other applications, such as electric vehicles (EV/HEV), military Light rail, aviation, electric bicycles, backup power supply, power generation (wind power generation, solar power generation), communication, consumer and entertainment electronics, signal monitoring RAM, detonators, automobile recorders, intelligent instruments, vacuum switches, digital cameras, motor drives, intelligent three meters, UPS, security equipment, communication equipment, flashlights, water meters, gas meters, taillights, small household appliances and other fields have broad market prospects.


Test method:

1. Electrostatic capacity test method:

(1) Test principle

The electrostatic capacity of supercapacitor is measured by the method of constant current discharge of the capacitor and calculated according to the formula. C=It (U1-U2), where: C - electrostatic capacity, F; I - Constant discharge current, A; U1, U2 - voltage, V; Discharge time required from t-U1 to U2, S

(2) Test procedure

Charge the capacitor with a current of 100A until the capacitor is charged to the working voltage and the voltage is constant for 10 seconds. Then discharge the capacitor with a current of 100A, taking U1 as 1.2VU2 as 1.0V. Record the discharge time within the voltage range, the total circulating electrostatic capacity, and take the average value.

2. Stored energy test

(1) Test principle:

The energy test of super capacitor is carried out by discharging the capacitor to 1/2 of the working voltage at constant power within the voltage range given by the capacitor. The output energy W of capacitor is obtained from the relationship between constant discharge power P and discharge time T, that is, W=P. T

(2) Test procedure

Charge the capacitor to the working voltage with a constant current of 100A, and then keep it constant until the charging current drops to the specified current (traction type 10A, starting type 1A). After 5 seconds of standstill, discharge the capacitor to 1/2 of the working voltage with a constant power, record the discharge time and calculate the value. Cycle the measurement for 3 times and take the average value.

3. Equivalent series resistance test (DC)

(1) Test principle

The internal resistance of the capacitor is measured according to the sudden change of voltage within 10ms after the capacitor disconnects the constant current charging circuit. In the formula: R-internal resistance of capacitor; U0 - Voltage before capacitor cut-off charging; Ui - Voltage within 10 ms after switching off charging; I - Cut off the current before charging.

(2) Measuring process

Charge the capacitor with a constant current of 100A, disconnect the charging circuit when 80% of the charging working voltage is reached, use a sampling machine to record the voltage change within 10 ms after the capacitor is powered off, calculate the internal resistance, repeat for 3 times, and take the average value.

4. Leakage current test

After the capacitor is charged to the rated voltage with a constant current of 100A, the capacitor is charged at this voltage for 30min at a constant voltage, and then it is left open for 72h. In the first three hours, record the voltage value every minute, and in the remaining time, record the voltage value every ten minutes.

Calculate the self discharge energy loss, SDLF=1 - (V/VW) 2, and the calculation time points are respectively 0.5,1,8,24,36,72h

Note: The voltage tester must have high input impedance to minimize the sound of the film.


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