The 2017 Toyota Prius Prime has 95 lithium-ion battery cells. Toyota arranged the cells in series, producing a nominal battery-pack voltage of about 351.5 volts.
The Prius Prime was the plug-in version of the fourth-generation Prius, introduced for the 2017 model year. Its larger 8.8-kWh battery enabled substantially more electric driving than the conventional Prius, while the gasoline engine retained the car’s hybrid flexibility.
A common mix-up is confusing cells with modules. The Prime’s pack contains 95 individual low-voltage lithium-ion cells; references to modules or the entire battery pack describe larger assemblies, not additional cells. The standard 2017 Prius also used different battery configurations depending on trim and market, so its cell count should not automatically be applied to the Prius Prime.
The cells are connected in series rather than in a large parallel bank. That arrangement raises the pack voltage while keeping the cell capacity comparatively modest, a design suited to the Prius Prime’s hybrid power electronics and electric motor.