BATTERY ENERGY STORAGE SYSTEM AND A METHOD OF ELECTRICALLY ISOLATING A PLURALITY OF BATTERY CELLS

A battery energy storage system and methods for electrically isolating a plurality of battery cells (106) from an interface port (144) are disclosed. In one example, a method comprises measuring an electrical parameter on a DC bus (132) to which the plurality of battery cells are electrically coupled. An individual battery cell electrical parameter is determined using the electrical parameter and a quantity of the battery cells. Based at least on comparing the individual battery cell electrical parameter to a predefined threshold, the plurality of battery cells (106) are electrically isolated from the interface port (144).