Lithium-Ion Batteries Emerge as Possible Culprit in Dreamliner Incidents
A succession of problems has plagued Boeing's 787 Dreamliner, but investigators are now most concerned about incidents involving overheating of lithium-ion batteries. Federal Aviation Administration (FAA) officials grounded Boeing's high-tech Dreamliner after battery electrolytes reportedly leaked from a lithium-ion battery onboard an All Nippon Airways flight on Wednesday. The liquid reportedly traveled through an electrical room floor to the outside of the aircraft, leaving burn marks around damaged areas.
The latest incident followed on the heels of two battery-related problems encountered on Japan Airlines flights and another on a United flight earlier this month. Those incidents happened in parallel with multiple other episodes, including two fuel leaks. Since July, the 787 has also encountered a damaged cockpit window, an oil leak, and two cracked engines, according to multiple news reports.
Auxiliary power batteries onboard a Japan Airlines Dreamliner 787 caught fire at Boston's Logan Airport on January 7. The battery was taken back to the National Transportation Safety Board's Materials Laboratory in Washington for further examination. (Source: NTSB)
Aviation experts said most of the problems are unrelated. "I tend not to believe that there's a single root cause behind all of this," David Freiwald, an assistant professor of aerospace at Embry-Riddle Aeronautical University, told Design News. "Any new system has teething or growing pains. A few issues are to be expected."
The incidents did motivate aviation authorities around the world to order stoppage of Boeing 787 flights, however. The FAA also announced it will work with Boeing engineers to conduct a comprehensive review of the 787's design and manufacture, with an emphasis on the aircraft's electrical power and distribution systems.
On its website, Boeing emphasized the safety of its new aircraft, releasing a statement saying, "The airplane has logged 50,000 hours of flight and there are more than 150 flights occurring daily. Its service is on par with the industry's best-ever introduction into service -- the Boeing 777. Like the 777, at 15 months of service, we are seeing the 787's fleet wide dispatch reliability well above 90 percent."
Most of the concern around the 787 involves the use of lithium-ion batteries. The 787 is the first commercial aircraft to employ them. Its electrical architecture also operates at a higher voltages than predecessors, experts told us. "In terms of the ancillary systems, almost everything on the 787 is electrical," Freiwald said. "Most aircraft systems operate at 115V AC, whereas this is a 230V system. It's a pretty substantial amount of power and current."
Freiwald added that the lithium-ion batteries are used for auxiliary power back-up. In the past, he said, commercial airliners have typically used nickel-cadmium chemistries.
Battery experts told Design News that the choice of a lithium-ion chemistry shouldn't be a problem, but it does call for tighter control. "Lithium-ion is a pretty energetic material," Eric Dietz, a professor of computer and information science at Purdue University, told us. "You've got oxidation and reduction reactions happening in close proximity to one another, so it's important to maintain engineering control around the battery." Email ThisPrintComment
User Rank Platinum Re: Dreamliner Batteries Jack Rupert, PE 1/17/2013 10:02:32 PM Login to Rate
It's interesting that this is the same technology that Ford just standardized on. While the article mentions the cooling systems used in autos and some of the other design components, I can't help but wonder what can happen a few years down the road in vehicles that are not properly maintained...whatever the definition of "properly" may be with respect to battery safety.
Reply Post Message Messages List Start a Board User Rank Blogger Re: Dreamliner Batteries Charles Murray 1/17/2013 5:43:49 PM Login to Rate
I agree, Al. The spotlight is very bright in this case. I initially wondered if the bright spotlight might be part of the problem here. But the succession of battery overheating incidents in January alone is hard to ignore. Reply Post Message Messages List Start a Board User Rank Blogger Dreamliner Batteries apresher 1/17/2013 5:26:21 PM Login to Rate
Chuck, Very interesting report. It's amazing how with a system as complex as the Dreamliner, there are a very large number of unknown variables to resolve. Tough for the Boeing engineers who are moving a project of this scope into the marketplace, especially in a spotlight as bright as this situation. Reply Post Message Messages List Start a Board User Rank Blogger fired Cabe Atwell 1/17/2013 3:20:15 PM Login to Rate
They obviously overlooked the battery design slightly in the initial stages of development. At least no one was hurt, but I am sure Boeing will fire a few on the battery team. With all the battery exploding incidents from the past, I am surprised that wasn't a concern for the engineering team. However, it could have been a manufacturing error.. Time will tell.