In today's MINI E weekly update, they shared some interesting info about the battery that powers the MINI E:
BASIC BATTERY MATH
Have you ever wondered where energy is stored in the MINI E? We all know the High Voltage battery occupies the space normally reserved for rear seat passengers in a MINI Cooper, but did you know the HV battery in the MINI E is actually an assembly of 5088 individual cells which work together to handle the energy storage functions for the car’s propulsion system?
The voltage for the HV battery system is approximately 390V when fully charged, but each of the 5088 cells has a much lower voltage. To start, 53 cells are connected in parallel to form what is called a unit. Much like setting glasses of water next to each other, connecting batteries in parallel does not alter the voltage, or pressure, but increases the storage capacity, or volume of the assembly. Next, two units are connected in series to form a module which roughly doubles the voltage. Mounting batteries in series is what is typically done in a flashlight with 1.5V alkaline cells – they are connected end to end from the positive to negative terminal, to increase voltage. The following step provides a dramatic increase in voltage by connecting 48 modules, in series, turning the 5088 cells into the full voltage HV battery. The complete battery assembly is mounted within three metal battery cases found underneath the neatly upholstered dome in the back of each MINI E, and weighs in at 573 pounds. Now you have a lot more to think about each time you plug in to recharge your favorite car.