HankLloydRight
No Roads
1. At the end of the ribbon you need to go sideways (change direction). It looks to me that the ribbon placement will cause some friction of the coolant?
I don't follow. The coolant doesn't change direction. It flows in one direction only in the ribbons. It goes down from one level to the next, but it's always flowing in one direction, as far as the coolant is concerned. It's no different than coolant in any radiator or a/c condenser.
If you're talking about the very end of the ribbon, there would likely be a manifold at the top and the bottom running across all the cooling ribbons in parallel. Whatever it is, this isn't rocket science and I'm sure the battery design engineers could solve these relatively simple problems.
2. When the pack is punctured from the bottom multiple cells are vulnerable, in horizontal placement. Also, the ribbon will be 100% damaged so it's going to be difficult to repair the pack after such incident.
I think that's still holds true for the current battery pack. Also, if you look at the diagram above, each cell only has cooling on one side, not both, so the lowest most cooling ribbon could be designed so it's between the lowest layer of batteries and the second lowest. There's no need design it so the cooling ribbon is on the very bottom of the pack. So if there's a puncture, there's less of a chance of hitting the cooling ribbon.
Still, these are easy problems to solve. I just threw the idea out there as a potential way to fit 2170 cells into the existing MS/MX battery pack form factor not requiring any redesign of the sheet metal of the chassis. I didn't do the math, but that could end up with less overall cell capacity rather than more. I don't know.