

Tesla Motors CEO Elon Musk speaks during during the 2011 Tribeca Film Festival after the movie: 'Revenge of the Electric Car'.  (Image credit: Getty Images via @daylife)

In an article appearing in Flight International,  the billionaire entrepreneur behind PayPal and SpaceX founder, Elon Musk, weighs in on Boeing's 787 battery issues. Musk knows at thing or two about lithium-ion batteries. As owner of electric car maker Tesla Motors, Musk, faced with similar design issues and safety concerns, chose a completely different architecture to power his vehicles. Could his own experience help Boeing? There is no question, Musk has some strong opinions:


Boeing 787 Battery Fundamentally Unsafe

By: Zach Rosenberg, Washington DC

29 Jan 2013





Both Boeing and Tesla use batteries fueled by lithium cobalt oxide, which is among the most energy-dense and flammable chemistries of lithium-ion batteries on the market. While Boeing elected to use a battery with a grouping of eight large cells, Tesla's batteries contain thousands of smaller cells that are independently separated to prevent fire in a single cell from harming the surrounding ones.


An aerospace-capable version of Tesla's battery has been developed for use in SpaceX's Falcon 9 space launch vehicle. SpaceX, also owned by Musk, competes with Boeing/Lockheed Martin joint venture United Launch Alliance for customers. Boeing has thus far declined offers of assistance from Tesla and SpaceX, says Musk.

"They [Boeing] believe they have this under control, although I think there is a fundamental safety issue with the architecture of a pack with large cells," writes Musk in an email. "It is much harder to maintain an even temperature in a large cell, as the distance from the center of the cell to the edge is much greater, which increases the risk of thermal runaway."

Musk's assessments of battery cells were confirmed by Donald Sadoway, a professor of electrical engineering at the Massachusetts Institute of Technology.

"I would have used the same words," says Sadoway. "I'm glad someone with such a big reputation put it on the line."

"He's engineered [Tesla's battery] to prevent the domino effect, while Boeing evidently doesn't have that engineering," adds Sadoway.

As a fleet-wide grounding enters its third week, the battery failures on 787s flown by Japan Airlines and All Nippon Airways eariler this month remain under investigation by the US National Transportation Safety Board. Japanese inspectors have cleared the maker of the battery, GS Yuasa, of any defects before the unit leaves the factory. But both Japanese and US investigators continue to examine and test the batteries to understand why they failed after they were integrated into the 787 electrical system and operated on commercial flights.

The NTSB, for example, has began a detailed examination of an undamaged 787 battery at a US Navy laboratory, hoping to "uncover signs of any degradation in expected performance".

Investigators are trying to find the answer to a problem that eluded Boeing and the FAA in the certification phase, even though the manufacturer and the regulator were well aware of the risks posed by lithium-ion batteries.

Mike Sinnett, Boeing's 787 chief project engineer, explained the careful design philosophy employed for the 787's battery system, the first to serve as a starter for an auxiliary power unit and emergency power back-up in a commercial aircraft.

"I design a cell to not fail and then assume it will and the ask the next 'what-if' questions," Sinnett said. "And then I design the batteries that if there is a failure of one cell it won't propagate to another. And then I assume that I am wrong and that it will propagate to antoher and then I design the enclosure and the redundancy of the equipment to assume that all the cells are involved and the airplane needs to be able to play through that."

via Flightglobal/ Flight International Elon Musk: Boeing 787 battery fundamentally unsafe.