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"The design offers five times the energy density of the existing cells it uses, as well as six times the power and an overall 16% improvement in range for vehicles in which it’s used."

I might be missing something here but if the energy density is '5x' more wouldn't there be a greater increase of range than 16%(barring that the weight doesn't go up significantly)?

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They meant energy storage capacity instead of density. The energy density is only 16% higher. The new cells are 46mmx80mm vs 21x700 for the previous model.

700 should be 70 shouldn't it?

Even if the weight of the cells doesn't change that much, if the new cells aren't as heat tolerant then there might be significantly more weight and space allocated for cooling, meaning you get less cells

I think that one of the big advantages of tabless batteries is supposed to be that they have a much larger contact area which makes them easier to cool, particularly spirally wound Li-Ion which is going to be hottest near the core.

But this is an area of active research and a fairly complex modeling problem, and I’m no expert.

New cells will heat up less due to lower internal resistance.

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