Comment by nomel
2 days ago
casing is around 25% of the mass of a cylindrical cell, with the rest being actual battery bits that can't have any stresses applied. is 25% weight saving that significant?
2 days ago
casing is around 25% of the mass of a cylindrical cell, with the rest being actual battery bits that can't have any stresses applied. is 25% weight saving that significant?
The idea is that you build the aircraft frame out of the battery.
If you can get it to work (a big if) you get to subtract the weight of the old frame before you make calculate the pseudo-density,
I understand, but that's my point. Currently the case is 25% of the battery. Only the case can be removed. If you move the fragile guts of the battery into the frame (in no way reducing their mass), you're effectively turning that 25% case to 0%. So, the most you can save is 25% battery weight.
That doesn't really nudge the power density needle all that much, especially when you consider that you don't throw batteries out the back as their energy is depleted, as you do with fuels.