Solar panels are devices that directly or indirectly convert solar radiation into electrical energy through photoelectric or photochemical effects by absorbing sunlight. The main material of most solar panels is “silicon”, but the cost of production is relatively high. So large that it has some limitations in its widespread use. Compared with ordinary batteries and rechargeable batteries, solar panels are greener products that are more energy-efficient and environmentally friendly.
The chemical energy storage is charged by a chemical reaction, and the electric energy is stored in the battery, and when necessary, it is discharged through a chemical reaction to output electric energy. Chemical energy storage equipment mainly includes lead-acid batteries, liquid flow batteries, sodium-sulfur batteries, and the like.
The lead-acid battery was invented by G.Plante in 1859. Since its inception, it has been the world's largest producer due to its low price, easy availability of raw materials, reliable performance, wide application temperature range and high current discharge. The most used batteries are widely used in the automotive, electric vehicle, military, communications, electric power, UPS, railway and other industries. In recent years, the application in the field of solar power has also increased.
(1) Basic structure
The lead-acid battery is composed of a positive electrode, a negative electrode, a separator, a casing, an electrolyte and a wiring pile head, wherein the active material of the positive electrode plate is lead dioxide (PbO 2 ), and the active material of the negative electrode plate is gray sponge lead (Pb). The electrolyte is dilute sulfuric acid (H2SO4).