car battery

A car battery is a type of electric battery that supplies electric energy to the starter motor and the ignition system of a vehicle’s engine. The term is also used for the main power source of an electric vehicle. They are usually lead-acid batteries that provide a nominal 12-volt (actual 12.6 volt) potential difference by serially connecting six cells that each produce about 2 to 2.1 volts. As other batteries of its type, it is made up of plates of lead and lead oxide. These plates are submerged into a 35％ sulfuric acid and 65％ water solution called the electrolyte solution. This process causes a chemical reaction that releases electrons, allowing them to flow through conductors thus producing electricity. Electric hybrid vehicles have demonstrated the ability to get 50 to 60 miles per gallon using a combination of batteries and small internal combustion engines. In the U.S., the market for hybrid vehicles has been growing at an annual rate of 80％. More than a million are on the road in Asia. The size of car battery market in 2006 was estimated at a little more than $2 billion, and should nearly double by 2011. An increasing share of market is now controlled by foreign-invested companies, who have developed a strong presence in this market since China’s entry into the WTO.