Battery module mounting area of an energy storage system

A battery module mounting area of an energy storage system for an electric vehicle, comprising:

• a first set of battery module compartments arranged along a first longitudinal side of the battery module mounting area;
• and
• a second set of battery module compartments arranged along a second longitudinal side of the battery module mounting area;
• and
• a middle bar arranged longitudinally along or proximate to a lateral center of the battery module mounting area,
• wherein each battery module compartment in the first and second sets of battery module compartments includes an insertion-side through which a battery module is configured to be inserted into the battery module compartment and/or removed from the battery module compartment wherein the insertion-side of each battery module compartment in the first and second sets of battery module compartments is exterior-facing relative to the electric vehicle and is configured to permit direct access from outside the electric vehicle for the insertion of the battery module into the battery module compartment and/or the removal of the battery module from the battery module compartment while the battery module mounting area remains integrated as part of the electric vehicle,
• wherein the insertion-side of each battery module compartment in the first and second sets of battery module compartments is configured to be closed via an insertion-side cover to form a battery housing with a closed compartment profile that is characterized by each battery module compartment being sealed from at least one other battery module compartment in the battery housing,
• wherein the middle bar divides the first set of battery module compartments from the second set of battery module compartments and is configured to structurally reinforce the battery module mounting area, and
• wherein the middle bar is a single bar that extends across the battery module mounting area, or wherein the middle bar is an aggregation of independently constructed interior firewalls, each of the independently constructed interior firewalls being positioned between a pair of laterally adjacent battery module compartments from the first and second sets of battery module compartments.