The Boeing 787's high-profile battery fire may have been the result of an engineering double-whammy: an energetic battery chemistry combined with a possibly inadequate cooling system.
Battery experts who spoke to Design News this week said that the 787's lithium-ion batteries employed a cobalt oxide cathode, which is known to be more prone to overheating than other lithium battery chemistries. If that chemistry was used without extra measures to draw heat away from the pack, it could be a problem, experts said.
"It's a no-brainer," Elton Cairns, a professor of chemical engineering at the University of California and a nationally known battery expert, told us. "If they used a cobalt oxide chemistry, then the battery should use a cooling system." Note: This article was originally posted to Design News on Jan. 25.Click to read the rest of this story on Design News.
Gratified to see that the focus of the investigation is going to the battery itself, which IMO was always the most likely suspect. It will be interesting to see what cooling measures were adopted, because it seems unlikely that this design requirement was simply ignored.
Also, before the press get all wound up about cooling, note that only two batteries, out of all the batteries in all the 787s out there, had this heat stress problem. Was the cooling design too close to the margin? Or was there something anomalous about some of the battery packs? It looks like some lithium-ion variants are more prone to overheating than others, for example.
My bet continues to be on the battery design itself. However this does not preclude taking other steps, to make even the more overheating-prone samples of such batteries safe to use.
Pictures of the battery make it appear that there were no cooling fans, no active liquid coolers, no heat pipes or even heat sinks in the battery design, only a 1/2" air channel around each cell to provide convective coupling to the metal battery case.
This is very interesting considering the battery packs were designed for high discharge/charge rates.
Elon Musk, who knows a bit about this, said the 787 battery design was incompetent and dangerous.
Has anyone considered the lack of adequate convective cooling at cruising altitude? I used to work at Los Alamos in the 80s and several devices designed at sea level would fail due to overheating at the 7700 feet altitude arising from the lower air density, especially CRT computer terminals.
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.