Development Analysis of Special Lithium Battery

Aircraft power supply includes the main power, auxiliary power supply, emergency power and secondary power supply.Air storage battery with ordinary commercial battery in different environments, the application of the biggest difference between the two former extreme environment, temperature of cold and hot alternation, the battery in the extreme

Condition of the electrical and heat transfer ability has more stringent requirements.In addition, based on the demand of vehicle load to the whole, the weight of the battery has been the concern of the aircraft power supply system design, one can obviously reduce weight of the vehicle energy storage system method is used lithium ion batteries technology.


Is the lithium ion battery.In 2011, the company has developed a new generation of hummingbird (hummingbird)special aircraft, only 16 cm in length, but flight 11 miles per hour, and tospecial the wind of 5 miles per hour, the weight is less than a AA battery, the power to

The source also for lithium ion batteries.First introduced in 2009, the European airbus company provided by Saft lithium ion battery system, as a start and standby power of airbus A350 aircraft;Boeing, the most advanced A787 jet, the main battery and auxiliary power unit (APU) battery is lithium ion battery;Since the 1980 s, Japanese companies with the support of the government in lithium ion battery research, mitsubishi, Yuasa, and other enterprises are well-known supplier of lithium ion.Foreign enterprises are attaches great importance to the development and protection of the market, research in the field ofspecial in lithium ion battery infancy had first to early movers.

As shown in figure 3, the aircraft with lithium ion batteries than energy of about 100 ~ 150 wh/kg, just to meet the minimum requirements of aircraft electric power system.To make the battery electric power systems with internal combustion engine level of the power system, its specific energy need to improve

More than 20 times.Expect a solid electrolyte and nanometer electrode technology is expected to make the lithium ion battery than energy respectively increased by more than 2 times and 5 times, but the technology is still in the basic research stage.

The large capacity high power lithium ion battery has very broad application prospects in the field ofspecial, but safety problem has become the bottleneck of restricting its development in the field, to be solved.On January 7, 2013, a Japan airlines Boeing 787 jet the auxiliary motion at the back of the fuselage

Power batteries overheating caused a fire, batteries and severely damaged, and its external shell not only the hot gas of the leakage of electrolyte and raise airframe structure have also been damaged half meters outside (figure 4).Only nine days later, another all Nippon airways Boeing 787 aircraft take off, when they are about to reach cruising altitude, also due to battery failure emergency landing, but 129 passengers and eight crew members safe escape.The survey found that the front of the aircraft fuselage main battery overheat of the cockpit under electronic hold burned, shell was badly damaged.On April 25, 2013, the federalspecial administration (FAA) has officially approved the Boeing modifications of about 787 cells, two days after a Boeing 787 to resume, the Boeing 787The lithium battery wave to the largely calm.

On a Boeing 787 lithium battery, he XM for large, etc .power battery group was analyzed, and the safety of the battery system is to put the oxidant) (the anode materials and fuel (anode materials and electrolyte) together, sealed in a closed container to store and release energy, the accident showed that the existing external short circuit and over charge and discharge of security protection measures and techniques are unable to cope with short circuit inside the battery.In terms of the current technical level, thermal runaway when it happens, make the whole battery modules rapid cooling, prevent the internal transfer between thermal runaway is most feasible.

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