There are many people who do not know what a capacitor is and even mistake a battery for a capacitor. What is the difference between a capacitor and a battery? Today, follow Xiaobian to understand it ~
Capacitor is a kind of energy storage element, its basic working principle is charging and discharging. In electronic circuits, the charging and discharging of capacitors are often used for circuit conversion. The charging process is the process of charge storage in the capacitor. When the capacitor is connected with the DC power supply, the charge on the metal plate connected with the positive pole of the power supply will flow to the metal plate connected with the negative pole of the power supply under the action of the electric field force, so as to realize charging. The discharge process is the process of releasing the stored charge of the capacitor. When the charged capacitor is located in a closed path without power supply, the charge on the negatively charged metal plate will run to the positively charged metal plate under the action of the electric field force, so that the positive and negative charges will be neutralized and discharge will be realized. The main functions of capacitors are charge storage, AC filtering or bypass, cutting off or blocking DC, providing tuning and oscillation, etc.
According to different media, capacitor products can be divided into electrolytic capacitors, organic capacitors and inorganic capacitors. In addition, with the development of technology and the diversification of application needs, supercapacitor comes into being, which is a new type of energy storage device between traditional capacitor and rechargeable battery.
In essence, a battery is a device that converts stored chemical energy into electricity. A battery is a small chemical reactor that reacts to produce high-energy electrons for injection into external devices. Such as purely from the point of view of chemical power, the battery can be divided into primary battery, secondary battery. The secondary batteries are rechargeable batteries, mainly including lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries and so on.