Capacitor charging and discharging



(1) The process of charging.

The process of charging a capacitor (storing charge and electrical energy) is called charging. Connect one plate of the capacitor to the positive pole of the power supply, and the other plate to the negative pole of the power supply, and the two plates are each carried with an equal amount of dissimilar charge. After charging, there is an electric field between the two plates of the capacitor, and the charging process stores the electrical energy obtained from the power supply in the capacitor.

(2) The process of discharge.

The process of making the charged capacitor lose its charge (releasing charge and electrical energy) is called discharging. For example, if a wire is used to connect the two poles of a capacitor, the charges on the two poles neutralize each other, and the capacitor will release charge and electrical energy. After discharge, the electric field between the two plates of the capacitor disappears, and electrical energy is converted into other forms of energy.

Battery self-discharge refers to the ability of the battery to store charge in an open circuit state. The types of self-discharge of lithium-ion batteries can be divided into physical self-discharge and chemical self-discharge. The battery cell is composed of the module by series and parallel, if the self-discharge consistency of the cell in the module is poor, it will lead to the inconsistency of the internal monomer terminal voltage after the module is stored for a period of time, resulting in the module in the charging and discharging process part of the monomer has reached the target voltage, while the other part of the monomer is still at a higher or lower voltage phenomenon, resulting in overcharge or overdischarge of the monomer, and even problems, which is also a challenge to the voltage equalization ability of the module. Self-discharge is an important performance indicator of lithium-ion capacitors.