just released report on battery fire, MIT professor said 787 box not good enough to allow 787 back into the sky !
Boeing has been consulting with Ford Motor Co., General Motors Co., General Electric Co., United Technologies Corp. and others for battery solutions that will get its plane back in the air, Bloomberg News reported, citing five people with knowledge of the matter who are not authorized to speak publicly.
Boeing wants to insulate the battery and build a better box to contain any fire, according to published reports. Federal Aviation Administration officials are expected to make a decision soon on whether to approve a plan by Boeing to revamp the 787's lithium ion batteries to prevent or contain future fires.
Donald Sadoway, John F. Elliott Professor of Materials Chemistry at MIT, thinks that won't be enough to get the Dreamliner back in the sky.
"How do we insure that we don't get into a fire condition in the first place? And I haven't heard enough to give me comfort on that one," Sadoway said.
They should have consulted Elon Musk of Tesla motors. They built next gen cars using Lithium Ion batteries and had the same problem as Boeing did. The problem with the 787 battery was that they made the cells in the battery too large and it caused too much heat in the battery which caused thermal runaway which acts as a short circuit in the battery. Tesla rebuilt their Lithium Ion batteries using thousands of micro cells. Tesla is flying high, Boeing is flying low. Boeing should have listened to Musk!
The defect desity per unit of area is the most important variable in the battery cell manufacturing. You can either reduce the defect density per unti of area(the option Boeing chose) or reduce the area of the cell plate (not a solution for many obvious reasons). The battery manufactruing process has to be cleaned up, a lot. The physics are fundamentally valid. The fix should work.