Function of automobile battery

It is a device that converts chemical energy into electrical energy. It belongs to DC power supply. Its functions include:
(1) When starting the engine, provide a strong starting current (200-600A) to the starter.
(2) When the generator is overloaded, it can assist the generator to supply power to the electrical equipment.
(3) When the engine is at idle speed, power is supplied to the electrical equipment.
(4) The battery is also a large-capacity capacitor, which can protect the electrical appliances of the car.
(5) When the voltage at the generator end is higher than the electromotive force of the lead battery, part of the electric energy will be converted into chemical energy for storage, that is, charging.