That's nice - but Tesla's cables can deliver 250 kW at 400 volts, and few if any cars can absorb power at that rate or higher for more than a few minutes. EA chargers can deliver 350 kW, but only at 800V. At 400 volts their 500 amp limit restricts them to 200 kW.
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Each cell is ~4 volts. A 400 volt pack would have 100 instances of 2 parallel cells, put in serie to make 400 volts.
During charging, all the current in the 800V arrangement would go through every cell. In the 400 volt arrangement half the current goes through each cell. The 800V pack only needs half the current for a given power, but the although the
BTW, the number of cells may be much greater than 200, but the same logic applies.