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Prismatic cells, especially the ones Toyota use, need to be restrained mechanically to prevent distortion. This mechanical bracing takes space and adds weight too. The larger cells also need heavier bus bars as interconnections whereas the smaller cylindrical cells have much smaller interconnects except where the strings aggregate. The prismatic cells form a large block that does not have the ability to dissipate heat from the center cells except by conduction into the adjacent cells.
Sometimes, older ideas work better. Prismatic cells are far better in low discharge scenarios where space is at a premium, hence their prevalence in the mobile phone space.
Simon
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