Voltage extraction in energy storage system

An energy storage system, ESS, for an electric vehicle or hybrid electric vehicle, wherein the ESS comprises at least one battery pack with a number of battery cells, wherein each battery cell provides a voltage level of x V and a current capacity of y A, and wherein a number a of battery cells are connected in series to provide a maximum traction voltage level of ax V for a high voltage system comprised in the vehicle and the number a of voltage levels, where a≥3 and a number b of groups of the series connected battery cells are connected in parallel for providing a maximum current level of by A and the number b of current levels, wherein the ESS further comprises:

• two or more connectors, wherein at least one connector is connected between the qth and (q+1)th battery cells in the 1st to nth groups of series connected battery cells for providing an output voltage level of qx V which is lower than the maximum traction voltage level of ax V and a current capacity of ny A, wherein 1≤q≤a−1, 1≤n≤b;
• and
• at least one regulator connected to the at least one connector, wherein the at least one regulator is configured to regulate the output voltage provided by the at least one connector and provide the regulated voltage to a low voltage system comprised in the vehicle and isolate the low voltage system from the high voltage system in the vehicle.