Boeing 787 Short Circuit
In my opinion, the battery problem of the Boeing 787 was caused by wrong connection of the battery to equipment of the jet plane.
The equipment works as a load to a power source. If the main power source or the battery of a 787 is adequately connected to the load or the equipment, no excess electric current would flow.
But when a power source for the equipment is changed from the main power source to the battery, there can be a part of the path of electric current in the equipment, which must be broken or open so that the part does not work as a short circuit for current from the battery.
If this part is, however, left closed by mistake, there would be a short circuit. Accordingly excess current would flow out of the battery and back to it. The current would not flow into the equipment but go back to the battery through the short-circuit part and heat the battery up till it burns.
But the battery fire accident occurred when the battery was not expected to be used. So, while the main power supply was providing power to the equipment, we can think, some mysterious factor caused wrong connection of the battery to the equipment with the short circuit part left as it was.
In this case the above last figure should be modified by connecting the current path from the main source to the equipment.
Put simply, there must have happened two unusual phenomena when the battery burnt up in a Boeing 787. First, while the main power source, which is actually engines of the jet, was providing electric current to equipment, the battery was connected to the equipment by mistake. Second, when some mysterious mechanism worked to link the battery at issue to the equipment, some short circuit part was left by mistake as it was, though the part was just a normal portion of the electric current path from the main power source.
In other word, when a power source for the equipment is normally changed from the main power source to the battery, the short circuit part is made open so as to avoid wrong setting of a possible short circuit segment for the battery. However, the part is just a normal part of the path and not a short circuit for electric current from the main power source.
It can be regraded as a mistake in logic of design of this power feeding system. No matter what condition makes the battery connected to the equipment regardless ongoing provision of power from the main power source, the possible short circuit portion must be made open so as to avoid occurrence of an electric short circuit accident. A mechanism must be installed that connecting of the battery to equipment inevitably makes the possible short circuit part open.
The lack of this mechanism must have led to the battery fire accident in some Boeing 787 jet planes. Engineers must check specifically what part of real electric circuits in or around the battery, a power control unit, and various devices fall into this possible short circuit portion.
http://engtechmag.wordpress.com/2013/03/19/boeing-dreamliner-787-battery-fix-an-annotated-graphic/
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