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First Layer or Improvements:
Measures to Eliminate the Root Cause (prevent internal heating of a cell)

  • Adjust the torque appropriately to tighten the nut connecting the electrode
  • Improved insulation of cells (wrap with insulation tape)
  • Improved insulation at the bottom of the battery case interior
  • Improved insulation between cells and between cells and the battery case
  • Improved insulation of the upper part of the battery case interior
  • Improved insulation of reinforced material of the battery case interior
  • Drain holes to address moisture
  • Lower the highest charge allowed in the battery monitoring unit and charger
  • Stabilize battery charging current
  • Improve protective function against over discharge
  • More stringent screening of the battery cells after production
  • Improve quality control, etc. in the production process

Wrap insulation tape around cell

Prevent loose nuts

Second Layer of Improvements:
Measures to prevent problems from spreading between cells

  • Insulation to isolate cells from each other and from the battery case to resist heat
  • Make a gas vent inside the battery case
  • Insulation around wiring inside the battery case to resist heat
  • A tube to join value valve and vent in lower fuselage

Phenol glass laminated panel between cell and case

Third Layer of Improvements Measures in the unlikely event of a battery failure
(a new enclosure to prevent trouble from spreading to the cabin)

  • Enclose the battery case
  • A tube to join value valve and vent in lower fuselage

Testing the enclosure

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