Energy storage arrangement with open ended compartments

An energy storage arrangement for a vehicle, the energy storage arrangement comprising:

• a battery supporting frame structure, comprising:
• a first elongated frame member, a second elongated frame member, and a third elongated frame member, each of the first, second and third elongated frame members arranged in parallel and extending in a first direction from a respective first end to a respective second end, wherein each of the first, second and third elongated frame members are arranged to be connected to a frame of the vehicle;
• and
• a first cross-member attached to the first and second elongated frame members at a distance from the respective first end of the first and second elongated frame members to form a first and a second compartment on a respective opposite side of the first cross-member, and a second cross-member attached to the second and third elongated frame members at a distance from the respective first end of the second and third elongated frame members to form a third and a fourth compartment on a respective opposite side of the second cross-member, wherein each of the first and third compartments is open ended at a first side of the battery supporting frame structure, the first side being arranged at a position corresponding to a position of the first end of at least one of the first, second and third elongated frame members;
• and
• a plurality of traction battery modules, wherein a first traction battery module is arranged in the first compartment, a second traction battery module is arranged in the second compartment, a third traction battery module is arranged in the third compartment, and a fourth traction battery module is arranged in the fourth compartment.