Now, federal investigators are trying to determine why a lithium-ion battery caught fire in Boeing’s long-awaited 787 Dreamliner last week, and they have grounded the planes until they figure it out.
While Boeing officials insist that the failure never endangered passengers or the plane’s integrity, the prospect that batteries would leak flammable fluids and smoke on flights packed with passengers has opened perhaps the most unnerving chapter in the technology’s relatively short life.
For Boeing, the development of the 787 represented a push into new technology and energy efficiency, and the company staked much of its future on the plane. It turned to the new batteries for many of the same reasons that Silicon Valley and Detroit have: they pack a lot of energy in a small package and, unlike older batteries, can be charged rapidly and frequently without loss of power.
Even though the safety standards are higher in aviation than most other industries, federal regulators decided in 2007 to approve Boeing’s use of lithium-ion batteries for the first time in one of its passenger jets. But the agency also required the company to take a series of steps, among them to keep pressure from building in the batteries and toxic gases from escaping.
Just as in the early days of aviation, “you cannot do pioneering work without assuming some risk,” said Hans Weber, president of Tecop, an aviation consulting firm. “In today’s world, we don’t have to pay the price of pioneering with death anymore, but we have to accept the fact we will have some incidents.”
Still, safeguards for lithium-ion batteries have progressed to the point that a fire on an airplane should never have happened, said Sanjeev Mukerjee, a chemistry professor at Northeastern University and an expert on batteries.
“If a battery of that size catches fire, then a whole bunch of mechanisms didn’t work,” Mr. Mukerjee said. “Whoever is making that battery is doing a really bad job.”
It is still not clear what caused the battery fire last week in Boston, about 30 minutes after a Japan Airlines 787 landed from Tokyo and passengers had gotten off the plane. The cleaning crew noticed smoke seeping into the cabin, and it took firefighters 40 minutes to put out the battery fire in the electrical bay in the back of the plane.
On Wednesday, a 787 had to make an emergency landing in Japan after pilots received a smoke alarm. Officials found that a battery in the front of the plane was charred and swollen. Chemicals appeared to have leaked, and black discolorations on the plane suggested that there had been smoke inside.
Investigators are considering a variety of causes, though it might be months before they pinpoint what went wrong and how to solve it. The problem could be in the basic design of the batteries, the units that charge them or in an undetected manufacturing flaw, experts said.
“It might not be the underlying technology; it might be the design of this particular unit,” said Robert A. McKenzie, an electrical engineer and an aviation lawyer.
Other industries have found out the hard way that minor imperfections in lithium-ion batteries can cause big problems. In 2006, Lenovo, IBM, Dell and Apple all recalled laptops because of concerns about the hazards of lithium-ion batteries manufactured by Sony.
General Motors last year announced a series of enhancements to its electric car, the Chevrolet Volt, after two lithium-ion batteries caught fire days after a crash test.
While those fires were started under extraordinary conditions — and did not involve Volt owners — General Motors nonetheless reacted swiftly to the negative publicity and bolstered the structure and cooling system to protect the battery further in the event of a serious accident.
And about four years ago, Toyota considered switching to lithium-ion batteries for its popular Prius hybrid but decided to stick with an older chemistry, nickel-metal hydride. The reason was cost, said John Hanson, a spokesman for the company.
Matthew L. Wald contributed reporting from Washington and Andrew Martin from New York.
Article source: http://www.nytimes.com/2013/01/18/business/inside-the-787-an-unsettling-risk-for-boeing.html?partner=rss&emc=rss