The role and classification of batteries

The basic function of the battery: start the vehicle and provide auxiliary power. Before the full text begins, let's first understand the function of the battery. The battery of a vehicle, also known as a battery, is a device that converts chemical energy into electrical energy. Its function is to supply power to the engine. When the vehicle is ready to start, the battery will discharge to provide power to the starter, and the starter drives the flywheel and crankshaft to rotate, thereby starting the vehicle. When the power supply of the engine is insufficient or not started, it provides power for the electric appliances in the car, such as the audio system and the lighting system. When the engine starts to supply power normally, the battery will collect and store the electric energy for future use.　　Automotive batteries can be roughly divided into two types: maintenance-free and ordinary batteries (non-maintenance-free). 　　Batteries are mainly divided into three types: ordinary batteries, dry-charge batteries and maintenance-free batteries. Among them, the batteries used in passenger cars that we all are more familiar with are basically ordinary batteries and maintenance-free batteries. At present, most models sold on the market use maintenance-free batteries, and most Japanese cars, even high-end Japanese cars such as Lexus and Infiniti, also use non-maintenance-free batteries, that is, ordinary batteries.　　 Ordinary batteries are also called lead-acid batteries. Its electrodes are composed of lead and lead oxides, and the electrolyte is an aqueous solution of sulfuric acid. The main advantages are stable voltage and low price; the disadvantages are low specific energy (that is, the electric energy stored per kilogram of battery), short service life and frequent daily maintenance. Old-fashioned ordinary batteries generally have a lifespan of about 2 years, and it is necessary to regularly check the height of the electrolyte and add distilled water. However, with the development of technology, the current life of ordinary batteries has become longer and maintenance is easier. As for the disadvantages, the price of ordinary batteries has also become more expensive.　　 Maintenance-free battery, as the name suggests, the biggest feature is 'maintenance-free'. Compared with ordinary batteries, its electrolyte consumption is very small, and there is basically no need to supplement distilled water during the service life. It also has the characteristics of shock resistance, high temperature resistance, small size, and small self-discharge. Of course, its price will be more expensive than ordinary batteries. As for the service life, the recommended replacement period for maintenance-free batteries under normal conditions is about 3 years, which is equivalent to ordinary batteries.
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