Lithium batteries replace lead-acid batteries and nickel-metal hydride batteries

The battery and its management system are one of the key technologies of electric vehicles. In the past few years, most companies have encountered embarrassment in the development of electric vehicles, mainly because of the use of lead-acid, nickel-cadmium, and nickel-metal hydride batteries (ni-mh). Now, through research and experimental comparison, the use of lead and nickel metal hydride batteries with higher energy density instead of lithium batteries for the automotive industry is becoming a core technology. It has light weight, large storage, high power, no pollution, No secondary pollution, long life, low self-discharge coefficient, wide range of temperature adaptation, electric bicycles, electric motorcycles, electric vehicles, electric trucks and other ideal car batteries. The disadvantage is that it is more expensive and has poor security. However, technologies for the development of new materials such as lithium manganate, lithium iron phosphate, and lithium vanadium phosphate have been developed, which have greatly improved the safety of lithium batteries and reduced costs. Lithium battery industrialization dynamics With the rapid decrease in cost and improvement in performance, many automakers have begun to use lithium batteries. For example, the cheap monomer (battery) lithium manganese battery (ie, lithium manganate battery) developed by Fuji Heavy Industries in cooperation with NEC has the characteristics of high safety and low manufacturing cost. Its service life in an on-board environment can reach 100,000 kilometers in 12 years, which is equivalent to the full life of a pure electric vehicle. Fast charging lithium battery by Toshiba, in addition to small features, large capacity, the use of a unified fixation technology for nanoparticles, can be uniformly adsorbed on the negative electrode of the lithium battery, and can be charged to 80% of the capacity within one minute, after 6 minutes Can be fully charged. In September 2005, Johnson Controls, a large American battery manufacturer, set up a research and development base in Milwaukee, Wisconsin, to process lithium batteries that meet the characteristics of electric vehicles. In August 2006, JCS won a two-year DOE contract under the U.S. Advanced Battery Alliance (USABC) lithium battery development project for pure electric vehicles, and signed a contract with automakers to supply high-power lithium batteries. There are currently the following types of power lithium-ion batteries: 1. Lead-acid batteries Lead-acid batteries have a history of more than 100 years and are widely used as starting power sources for internal combustion engine vehicles. It is also a mature electric vehicle battery, and the current adoption rate is about 8%-90%. The reliability is good, the raw materials are easily available, and the price is low. The specific power can basically meet the power requirements of electric vehicles. But it has two major disadvantages; firstly, it has low specific energy, occupies too much mass and volume, and has a short driving range on a single charge. The second is short life and high cost. Nickel-cadmium batteries are second only to lead-acid batteries in application, with a specific energy of up to 55W. H/kg, specific power greater than 190W/kg, fast charging, long cycle life, more than twice that of lead-acid batteries, up to 2000 times, but the price of lead-acid batteries is 4-5 times. Although its initial purchase cost is relatively high, its long-term actual use cost is not high due to its advantages in energy and service life. In the process of use, attention should be paid to recycling to prevent environmental pollution caused by heavy metal cadmium. Nickel-metal hydride batteries are the same as nickel-cadmium batteries and are also alkaline batteries. Their characteristics are similar to those of nickel-cadmium batteries. However, nickel-hydrogen batteries do not contain cadmium or copper, and there is no heavy metal pollution. At present, the important company that processes nickel-metal hydride batteries for electric vehicles is Ovonie. The company has two batteries, 80A?H and 130a?. From this form, there are two specifications of 30kw?H and 50kw?H batteries. Its specific energy is 75-80w, right? H/kg, the specific power can reach 160-230w/kg, and the cycle life is more than 600 times. These batteries have been tested on several electric vehicles, one of which can travel 345 kilometers on a single charge, and the other can travel more than 80,000 kilometers a year. Due to the high price, there is no mass processing yet. It is estimated that with the development of nickel-hydrogen battery technology, its specific energy can reach more than 80w. H/kg, cycle life can reach more than 2000 times, the expected price can be reduced to 150 US dollars/Kw? General Motors has made it a priority development direction for electric vehicle batteries in the next few years. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Why has graphene batteries become the most concerned battery?