18650 battery 3.7v 6000mah.Power batteries seek breakthroughs: Comparison of lead-acid, iron and lithium batteries

　　Electric vehicles have relatively high requirements for batteries, such as high specific energy, high specific power, fast charging and deep discharge functions, and long cycle and service life. The biggest bottleneck restricting electric vehicles is the battery. From the perspective of use, lead-acid batteries, as a relatively mature technology, can be mass-produced. They have high cost performance and high rate discharge characteristics, but their specific energy, specific power and energy density are relatively low. Nickel metal hydride batteries have better safety performance than lithium batteries, but lithium batteries have higher energy density and cycle life. At present, there are many domestic lithium battery manufacturers, especially lithium iron phosphate batteries, which are developing rapidly.

　　Currently, more and more researchers are choosing lithium-ion batteries as power batteries for electric vehicles because lithium-ion power batteries have the following advantages: high operating voltage, equivalent to 3 times that of nickel-cadmium batteries and hydrogen-nickel batteries; large specific energy, It can reach 165WH/kg, which is 3 times that of nickel-hydrogen batteries; it is small in size; light in weight; long cycle life; low self-discharge rate; no memory effect; no pollution, etc. If lithium-ion batteries are used, it is difficult to reduce the cost of electric vehicles. Lithium iron phosphate battery is also a lithium battery. Its specific energy is less than half that of lithium cobalt oxide battery. However, it is highly safe, can cycle up to 2,000 times, has stable discharge, and is cheap, making it a new choice for vehicle power.

　　In addition to increasing research on lithium batteries, companies are also looking for new breakthroughs in power batteries. The power battery currently used by BYD's electric vehicles is a ferropower battery called "ET-pOWER", which is BYD's latest achievement in the battery field. Iron batteries have a wide range of raw materials, are pollution-free, and are recyclable. Their heat resistance, pressure resistance, and capacity are much stronger than ordinary batteries. The number of battery charging cycles can reach more than 2,000, and the battery's continuous mileage life is more than 600,000 kilometers. Taking F3DM as an example, it can last 100 kilometers in pure electric mode.

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