How should we dealing with Li-ion Battery for flight safty?

As you know the Boeing 787 has been grounded by caught fire on the Li-ion battery.

It looks like Japanese battery may have some issues on this incident:-(

You might reminded some laptop PCs caught fire by its Li-ion battery, few years before.

It is ironic to the restriction of Li-ion batteries for carry on baggage and air cargo.

Our copters will not fly without high power density Li-Po.

How do you treat your Li-Po battery and deposit after some failure ?

Views: 1632

Comment by Gary McCray on January 17, 2013 at 5:39pm

I could be wrong. but my guess is this will be traced to frequent and high change of air pressure.

Most of our LiPo batteries are foil in a plastic pouch batteries and they evolve gas during use.

In a plane continuously transitioning from a 10,000 foot interior (assuming normal pressurized) altitude to ground level the evolved gases also expand and contract according to altitude and do stress an operating battery.

If insufficient thought was given to this aspect, this is the outcome you would expect.

Could easily be something else, but the bottom line is clearly that this battery was not adequately designed for it's intended use.

Either inadequate engineering or cutting corners.

Too bad, it gives LiPos a bad name and a lot of our future, not just RC stuff will depend on LiPos becoming prevalent.

Disposal will also need to be better addressed than it is now.

Comment by Jake Wells on January 17, 2013 at 6:22pm

I store mine in a pillow case filled with straw under my kids crib mattress. That's good right?

Comment by James masterman on January 17, 2013 at 8:05pm

I prefer to keep mine next to my open fireplace. Wouldn't want them getting cold.

Comment by Jake Wells on January 17, 2013 at 8:09pm

That's what I'm talking about James. Caring for your things. Going above and beyond. Bravo! I also like to poke air holes into them so they can breathe. Nobody likes to suffocate.

Comment by Quadguy on January 17, 2013 at 8:38pm

Its not right to jump on conclusion about cause of fire. Lets wait and see what investigation reveals.

Comment by Gary McCray on January 17, 2013 at 8:42pm

Not jumping just speculating, anxiously await actual data.

Comment by Greg Fletcher on January 17, 2013 at 9:10pm

Gary, It could be a problem not encountered before, pressure cycling many times. Actually the 787's carbon fuse is rated higher than traditional aluminum construction. Normal jets pressurize to 8000 ft. and the 787 goes to 6000 ft. Better for the passengers.

Having said that, I would bet it is the first jet to use Li for battery back up. Most Lipos don't pressure cycle all as much as a Japanese airliner.

You could be on to something. I know some scientists working on next gen Li cells(where I work), and I will definitely run this by him. I hate to see Boeing hurt like this. This will be tested in the lab for sure if it hasn't been all ready.

Comment by John on January 17, 2013 at 9:13pm

The 787 battery and system went through thousands of hours of flight test and certification without a problem. It will be interesting to see what the cause was while in service. I'm sure Boeing and the suppliers are looking at all avenues. This is the first time a Li-ion battery has been used on a commercial aircraft.

For me I store my Li-po batteries in an ammo can I got for a few dollars from the army navy store. It looks like it's probably a 7.62 round but they had the larger 50 cal boxes as well.

Just a safety note....After a crash it is very dangerous to reuse the battery if there is any kind of visual damage or not on it. There may be internal damage to the cells that may not be apparent upon visual inspection but that may cause the battery to ignite during a charge cycle. Also do not charge above it's rated capacity.

Comment by Jack Crossfire on January 17, 2013 at 10:06pm

It has more to do with the way information travels around large corporations like Boeing than any technical problem. 


Admin
Comment by Gary Mortimer on January 18, 2013 at 5:34am

+1 on Jack

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