As an emergency power source, the aircraft battery provides electrical energy to a few important equipment to ensure that the aircraft can take off and land safely. The performance and safety of aircraft batteries have a significant impact on flight.
Although lithium batteries have been widely used, there are still certain defects and risks in the process of use. On the one hand, the internal diaphragm is easily damaged to cause a short circuit of the battery, resulting in the thermal runaway of the battery; on the other hand, when overcharging, lithium forms on the surface of the negative electrode material Dendrites, sharp dendrites piercing the separator can easily lead to short circuits, which can lead to thermal runaway.
In 2013, two lithium-ion battery accidents occurred in a row on Boeing B787-800, which led to widespread concern about the safety of lithium-ion batteries, and a series of studies were carried out. Through the investigation and analysis of the typical accident causes of aircraft lithium battery fires, it can be concluded that the common causes of aircraft lithium battery accidents mainly include:
1.Thermal runaway caused by a short circuit of a single battery.
2.Due to poor insulation isolation of the battery pack, resulting in the heat generated by the thermal runaway of a single battery is conducted to other batteries, eventually causing the entire battery pack to catch fire.
3.In the process of aircraft airworthiness certification, there is a lack of safety assessment of the danger caused by the failure of aviation lithium batteries.
