Tesla CEO Elon Musk Says Boeing's 787 Dreamliner Battery is Unsafe
January 30, 2013 12:44 PM
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He offered his help to Boeing, but the company declined
Boeing's 787 Dreamliner jet has had a lot of troubles lately --
namely with its batteries
-- and the last person the aerospace company likely wanted advice from was competitor Elon Musk.
Musk, the CEO of automaker Tesla and private space transport company SpaceX, recently told
that the 787 Dreamliner's batteries are "inherently unsafe." His company SpaceX competes with the Boeing/Lockheed Martin partnership, United Launch Alliance, in the aerospace sector.
"Unfortunately, the pack architecture supplied to Boeing is inherently unsafe," said Musk.
"Large cells without enough space between them to isolate against the cell-to-cell thermal domino effect means it is simply a matter of time before there are more incidents of this nature. Moreover, when thermal runaway occurs with a big cell, a proportionately larger amount of energy is released and it is very difficult to prevent that energy from then heating up the neighboring cells and causing a domino effect that results in the entire pack catching fire."
However, Mike Sinnett, Boeing's 787 chief project engineer, defended the design and development of the batteries.
"I design a cell to not fail and then assume it will and then ask the next 'what-if' questions," said Sinnett. "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 another 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."
Musk's Tesla uses batteries fueled by lithium cobalt oxide, which is what Boeing uses for the 787. Musk understands that these batteries have highly flammable tendencies, and even offered his help to Boeing in its construction, but Boeing declined.
"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," said Musk. "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."
In a recent report by
The New York Times
, it was discovered that Boeing knew about the battery fire issues in the 787 before this month's problems occurred, which grounded the jets in the U.S., Japan and India.
The report said that Japanese airline All Nippon Airways (ANA) replaced 10 787 batteries from May to December of 2012. Reasons included an unexpectedly low charge in the main battery, batteries that failed to start normally and one battery showing an error reading.
Japan Airline (JAL) also had "several cases" where it had to replace the 787's batteries before the issues that occurred this month, but it didn't disclose an exact number.
The airlines said they reported the incidents' to Boeing, but Boeing felt they didn't need to alert safety regulators because it was not considered a safety issue, but rather "within the scope of regular maintenance" carried out by airline crews.
It was also recently discovered that the Japanese government
loosened safety regulations for the 787 Dreamliner
back in 2008 in an effort to speed up the aircraft's deployment within the country.
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Musk is right.
1/30/2013 8:33:49 PM
Musk is 100% correct. The thermal problems encountered by the use of lithium batteries with Cobalt electrodes is very unstable in that situation. The problem is in different parts of the design as well. Musk is right the fact they are too close to prevent thermal issues, but also in the way they charge the batteries as well. They expect the charge to be anywhere from 75-80% charge in about 80mins. BIG problem, you go from operating temp of around 60 degrees to 140 degrees in such a short time thermally you propagated the temp by x amount too fast. Cobalt at that temp becomes unstable.. Now with no real cooling solution and the close proximity of the cells not allowing heat to dissipate, it's not logical to think something wont get out of hand. I hate engineers who are so pompous that they can't realize they made a mistake. You give us a very bad name. The engineers of the 60's and 70's were so much better then nowadays. They actually knew what they were doing. You make me ashamed @ times to be an engineer. It's so logical your faults In your design and yet you stupidly ignore facts.
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