Selection specification modification

For the selection of super capacitors, power requirements, discharge time and system voltage changes play a decisive role. Super capacitor manufacturer The output voltage drop of is composed of two parts, one is the energy released by the supercapacitor; The other part is caused by the internal resistance of supercapacitor. Who takes the lead depends on the time. In a very fast pulse, the internal resistance takes the lead. On the contrary, in a long time discharge, the capacitive part takes the lead.

Parameter selection

The following basic parameters determine the size of the selected capacitor: supercapacitor module. Operation voltage; Operation cut-off voltage; Uniform discharge current; How long is the discharge time.

Compared with batteries, supercapacitors have the following characteristics:

Ultra low series equivalent resistance (LOW ESR), power density is dozens of times more than lithium ion battery, suitable for high current discharge (a 4.7F capacitor can release more than 18A of instantaneous current).

Super long life, charging and discharging more than 500000 times, 500 times of Li Ion battery, 1000 times of Ni MH and Ni Cd battery Farad capacitor Charge and discharge 20 times a day, and the continuous operation can reach 68 years.

Capable of charging with large current, short charging and discharging time, simple requirements for charging circuit, no recall effect.

Farad capacitor is free of protection and can be sealed.

The temperature range is - 40 ℃~+70 ℃, and the general battery temperature is - 20 ℃~60 ℃.

Super capacitors can be formed in series and parallel Super capacitor module It can withstand pressure and store higher capacity.

Specific selection method:

Supercapacitors are different from batteries. In some applications, they may be better than batteries. Sometimes it is a better way to combine the power characteristics of capacitors and the high energy storage of batteries.

The super capacitor module can be charged to any potential within its extra voltage range and can be completely discharged. The battery is restricted by its own chemical reaction and operates in a narrow voltage range. If it is over discharged, it may be damaged.

Supercapacitors can be charged quickly while batteries can be damaged by fast charging.

Supercapacitors can repeat hundreds of thousands of cycles, while battery life is only a few hundred cycles.