NTSB Says Boeing 787 Battery Fire Not Due to Overcharging, Quick Fix Unlikely
January 21, 2013 12:11 PM
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The investigation is ongoing
The National Transportation Safety Board announced over the weekend that x-rays and CT scans of the lithium-ion battery pack that caught fire in a Boeing 787 Dreamliner in Boston recently was not overcharged. The battery in question powered the plane’s auxiliary power unit and the investigators have disassembled the battery and are still investigating some of the individual battery cells.
has led airlines to stop flying the 787 planes around the world. The NTSB investigators have also said that they have examined several other components from the aircraft including battery management circuit boards and associated bundles of wire. The investigators also intend to continue testing components such as the battery charger and battery management unit.
The investigators have announced that the plane's flight data recorder indicates that the battery never exceeded its design voltage of 32 volts. The FAA issued a directive last week that the Boeing 787 Dreamliner should not fly until any problems with the battery packs are resolved.
Boeing has announced that it will halt deliveries of the 787 to customers while it works with the FAA to solve the battery issues. The batteries at the center of the investigation are lithium-ion units manufactured in Japan by GS Yusana under a subcontract to a company called Thales.
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RE: IEEE's theory
1/22/2013 10:38:02 AM
The problem with the thermal theory is the cells at the end of the battery box seem to be the ones that have collapsed, which suggests they were the ones that actually failed, not the ones in the middle, which is where it would be hardest to dissipate heat.
RE: IEEE's theory
1/22/2013 3:05:11 PM
Not necessarily. It depends on battery surrounding (airflow, contact with heat dissipating surfaces, etc.).
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