Electric vehicle battery
Due to concern for environmental damage associated with emissions from internal combustion engines, alternative means of propelling vehicles has received increased attention. The increasing demand to improve fuel economy and reduce emissions in present vehicles has led to the development of electric vehicles. Electronic vehicles are generally classified into an ordinary electric vehicle which uses only a motor as the drive source for running and a hybrid vehicle which uses both the engine and motor as its drive sources. ybrid electric vehicles include an internal combustion engine and at least one electric motor powered by a battery array. In a parallel type hybrid electric vehicle, both the internal combustion engine and the electric motor are coupled to the drive train via mechanical means. An electrical powered vehicle typically includes an electric motor and drive train supported on a frame and enclosed in a body. A battery or bank of batteries are supported on the frame and connect to the electric motor to provide power thereto. Generally, the battery that provides the main power to an electric vehicle is one of the most important components that determines the quality of the vehicle. The range of electric vehicles is limited as the size of the battery array which can be installed on the vehicle is limited. As the battery for electric vehicle (EV) or hybrid electric vehicles (HEV), a lithium secondary battery has drawn attention in recent years for the high energy density. The lithium secondary battery uses a lithium compound as the active material of positive electrode and a carbon material as the negative electrode. This battery can give a long running distance covered per one charging operation, as compared with conventional lead-acid battery or metal-hydride battery. A typical electric vehicle is equipped with a battery management system (BMS) that manages all of the states of the battery by monitoring battery states.
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