All that aside... They installed a TITANIUM box to contain an overheating li-ion battery!? The question I have is... ARE THEY NUTS!? Have they seen a titanium fire? Nothing, and I mean absolutely NOTHING can suppress that until all titanium burns out. How high titanium burns? 2500C? 3500C? Am I the only one who thinks that an overheating li-ion battery can start a fire which will then ignite the "titanium box" and that will be the end?
You think Airbus and Boeing engineers and the certifying authorities are nuts?
A Li-ion battery burns at 1,000C. The melting point of solid Titanium is 1,686C. While molten Titanium can burn, it can also be treated during manufacture to reduce the risk of burning.
Simply, because you don't need a containment system if something is working as it ought to.
Just about the entire electronics world has moved to Li-ion batteries. Any device with a rechargeable Li-ion battery has a risk of fire caused by a failure. I have personally seen a laptop and camera burst into flames because of failed batteries, both were completely destroyed. It seems the entire world has accepted the small risk when it comes to our personal devices. Until battery technology moves on and delivers either safer Li-ion units or another technology that beats Li-ion price/weight performance, we will carry on using them.
Both Airbus and Boeing have moved to Li-ion batteries for the A350 and 787. Both have implemented similar containment systems to cover failures of those batteries. So it seems we have a simple choice - use the preferred battery technology with certified mitigation solutions in place or don't allow their use in aviation. The certifying authorities have gone for the former.
I agree, in a perfect world Li-ion batteries would never fail. Unfortunately, we don't inhabit that world so the next best solution is to ensure a fire caused by a failed battery cannot fatally damage the plane. So far (and that's all you can ever say), it looks as though the solutions are working as designed.
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