Tesla battery packs connect like 96 cells in a row to achieve the desired voltage and then many rows wired in parallel for the current. As P=U*I, you have to us

Tesla battery packs connect like 96 cells in a row to achieve the desired voltage and then many rows wired in parallel for the current. As P=U*I, you have to use 400V to keep the motor current somwhat reasonable. Still, for the performance Model S, the current at which the pyrotechnical breakers cut in ist 1500A, which is beyond scary :).