That’s how battery chemistry works. Even this, if it is real, is a bunch of individual cells in a bank. There is no alternative; you can’t have sufficient reactivity between dissimilar materials to generate the types of voltages required in a single cell. You need multiples of them in series to hit 200 volts, 400, 600, whatever is required by the vehicle’s drive hardware.
That’s how battery chemistry works. Even this, if it is real, is a bunch of individual cells in a bank. There is no alternative; you can’t have sufficient reactivity between dissimilar materials to generate the types of voltages required in a single cell. You need multiples of them in series to hit 200 volts, 400, 600, whatever is required by the vehicle’s drive hardware.