Principle of battery power generation

Electrical energy is converted into chemical energy, and chemical energy is converted into electrical energy during discharge. When the battery is discharged, metal lead is the negative electrode, which loses electrons due to oxidation reaction and is oxidized into lead sulfate; Lead dioxide is the positive electrode, and the electrons obtained by the reduction reaction are reduced to lead sulfate. When the battery is charged with direct current, lead and lead dioxide are generated at two poles respectively. After the power supply is removed, it returns to the state before discharge, forming a chemical battery.