Analyze the development status of aviation lithium-ion batteries

The current development of aviation lithium-ion batteries has more stringent requirements on the electrical performance and heat transfer capacity in the environment. In addition, according to the aircraft’s total load requirements, the weight of the battery has always been a concern in the design of aircraft power systems. One way to significantly reduce the weight of aircraft energy storage systems is to use lithium-ion battery technology. The U.S. military has used small unmanned reconnaissance aircraft in Iraq and Afghanistan, and the dragoneye developed by Americanaerospaceenvironmentcorp. is best known for its fully automatic, recyclable, and handheld launch function. , And its power source lithium-ion battery. In 2011, the company developed a new generation of hummingbird reconnaissance aircraft, which is only 16 cm long, can fly at 11 miles per hour, can withstand winds of 5 miles per hour, and weighs less than the weight of an AA battery. The source is also Lithium Ion Battery. In 2009, the European Airbus Company introduced the lithium-ion battery system supplied by Saft for the first time as a starting and backup power source for the Airbus A350. The main battery and auxiliary power unit (APU) of Boeing's most advanced A787 airliner use lithium-ion batteries. Since the 1980s, with government support, Japanese companies have been investing in lithium-ion battery research. Companies such as Mitsubishi and Yuasa are well-known lithium ion suppliers. Foreign companies attach great importance to market development and protection, and research in the field of aviation lithium-ion batteries is in its infancy. The specific energy of lithium-ion batteries used in airplanes is about 100~150Wh/kg, which can only meet the minimum requirements of airplane power systems. In order to make the battery power system reach the same level as the internal combustion engine power system, the specific energy of the battery should be increased by 20 times. It is expected that solid electrolyte and nano-electrode technologies will increase the specific energy of lithium-ion batteries by more than 2 times and 5 times, respectively, but related technologies are still in the basic research stage. Large-capacity, high-power lithium-ion batteries have very broad application prospects in the aviation field, but safety issues have become a bottleneck restricting their development and urgently need to be resolved. On January 7, 2013, the rear fuselage of a Boeing 787 aircraft of Japan Airlines (JAL) was helped. Not only was the battery and the outer shell severely damaged, but the generated hot gas leaked electrolyte and damaged the aircraft structure. Meters away (Figure 4). Just 9 days later, another All Nippon Airways Boeing 787 took off and made an emergency landing due to battery problems as if it was about to reach cruising altitude. 129 passengers and 8 crew members escaped safely. An investigation found that the main battery in the electronic compartment under the cockpit of the front fuselage of the aircraft was overheated and burned out, causing serious damage to the fuselage. On April 25, 2013, the Federal Aviation Administration (FAA) formally approved Boeing. Boeing's plan to modify the battery of the 787 passenger aircraft. Two days later, the Boeing 787 resumed its flight. For the Boeing 787 lithium-ion battery, the safety of his xm high-power battery is analyzed, and the battery of the system is an oxidant) (anode material and fuel (negative electrode material and electrolyte) together, sealed in a closed container to store and release energy The accident showed that the existing external short-circuit, charging and discharging safety protection measures and technologies cannot cope with the internal short-circuit of the battery. Under the current technical level, when thermal runaway occurs, the most feasible method is to quickly cool the entire battery module. Prevent thermal runaway transfer between the batteries in the module. Statement: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous one: Brief analysis of the importance of polymer lithium-ion battery protection board