Storage Battery is an installation that directly converts chemical energy into electrical energy. It is a rechargeable battery designed to be recharged after a reversible chemical reaction. It usually refers to a lead-acid battery, which is a type of battery , Belongs to the secondary battery. Its working principle: during charging, external electric energy is used to regenerate the internal active materials, and the electric energy is stored as chemical energy.

　　When the demand is discharged, the chemical energy is converted into electrical output again, such as the cell phone battery commonly used in daily life. It uses a lead substrate grid filled with spongy lead (also called a grid) as a negative electrode, a lead substrate grid filled with lead dioxide as a positive electrode, and dilute sulfuric acid with a density of 1.26--1.33g/mlg/ml as an electrolyte. When the battery is discharging, the metal lead is the negative electrode, causing an oxidation reaction to generate lead sulfate.

　　Lead dioxide is the positive electrode, which produces a recovery response and produces lead sulfate. When the battery is charged with direct current, elemental lead and lead dioxide are generated at the two poles. After removing the power source, it returns to the state before discharge to form a chemical battery. Lead storage battery can be charged and discharged repeatedly. Its cell voltage is 2V. The battery is a battery pack composed of one or more cells, referred to as storage battery. The common one is 6V, and there are 2V, 4V, 8V, 24V storage batteries.

　　For example, the battery (commonly known as the battery) used in a car is a 12V battery pack with 6 lead batteries connected in series. Battery diagram. Battery diagram. For traditional dry-charged lead batteries (such as automobile dry-charged batteries, motorcycle dry-charged batteries, etc.), distilled water should be added after a period of use, so that the diluted sulfuric acid electrolyte maintains a density of about 1.28g/ml; Regarding maintenance-free batteries, distilled water is no longer required to be used until the end of their life.