Reducing the sheer number of casings on individual cells would radically reduce weight/volume.
Then with less groups of cells you could actually have the BMS monitor them like my lifepo lithium battery for bicycle.
It might not be that the number of layers makes it fundamentally expensive.But instead the design and manufacturing might not be yet very optimized.
If a cell burns it is going to take out its neighbors anyway.
Or they could start to do something similar to LiFePo4 which will not burn.
Reducing the sheer number of casings on individual cells would radically reduce weight/volume.
Then with less groups of cells you could actually have the BMS monitor them like my lifepo lithium battery for bicycle.