Solar Impulse 2 Batteries – Better than We Thought

Dean Sigler Batteries, Solar Power, Sustainable Aviation Leave a Comment

What happened to Solar Impulse 2’s batteries on those long five days and nights over the Pacific?  It took months of enforced downtime in Hawaii to have new batteries made, sent from Korea, installed, tested, and flown again.  Could the plane have completed the flight on the original batteries? Kokam, manufacturer of the airplane’s cells, has released new information that provides details of the drive system and relieves a few lingering anxieties.  An over-riding concern was that batteries overheated on the Japan to Hawaii part of the mission, topping out at 50 degrees Centigrade (122 degrees Fahrenheit) – above their design temperature.  Your editor has thought deeply about what Andre’ Borschberg must have gone through every day of the five over the Pacific, seeing the temperatures on the four battery packs climbing as he pointed the airplane’s nose up in its saw tooth flight profile. Borschberg explained that stress in a comment on SI2’s blog.  “”I feel exhilarated by this …