Another story came out yesterday, saying that Boeing intends to provide more space between cells. It's worth mentioning, however, that Boeing's spokespeople are not commenting, so we don't know for sure.
I saw a graphic that Boeing was going to stick a vented containment around the existing battery box. I doubt that will satisfy the FAA and NTSB. Aside of the whole qualification time lag, why wouldn't they swap the Lion battery units with NiMH-based assemblies? Since they seem to have the space to put a box around the existing box, they could definitely go to a lower energy density battery technology.
this link shows some of the aviation incidents involving smoke, fire, extreme heat or explosion - and we continue to fly. 787 battery issue is a marketing issue, I hope the Dreamliner wil not change the name to Incubusliner.
@g_ost: It's hard to tell whether Airbus's decision to switch to NiCd for the A350 is more about public relations or safety. They've been flying A350s with lithium-ion batteries successfully so far. But being able to say that they don't have the "bad" battery chemistry that Boeing has may give Airbus an advantage with customers and regulators.
Due to 787 battery problems Airbus dispensed for A350 to the installation of lithium batteries. The first aircraft will be delivered with cadmium batteries, not lithium batteries. But the first test flights will attend Airbus with lithium batteries.
For large capacity multi cell series/parallel batteries each series stack typically will have its own controller. If thermal runaway begins in one cell, the consensus seems to be removing the charging current will NOT stop the runaway. See the nfpa link:
Other links regarding marine applications of lithium-ion batteries indicate that monitoring the individual cells (series stacks) is absolutely critical to prevent runaway. If this degree of protection is reasonable for a boat, I can't imagine it isn't practiced on an aircraft.
Yes, isolating each cell physically and electrically is doable, at a cost - but, if due to manufacturing defect or degradation over time, a cell develops an internal short, is it sufficient to just stop the charging current? Or will the stored energy through the short circuit lead to thermal runaway anyway? Does anybody here know?
The 100% solar-powered airplane Solar Impulse 2 is prepping for its upcoming flight, becoming the first plane to fly around the world without using fuel. It's able to do so because of above-average performance by all of the technologies that go into it, especially materials.
With major product releases coming from big names like Sony, Microsoft, and Samsung, and big investments by companies like Facebook, 2015 could be the year that virtual reality (VR) and augmented reality (AR) finally pop. Here's take a look back at some of the technologies that got us here (for better and worse).
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