Battery pack structures and systems

A battery pack comprising:

• a longitudinal beam characterized by a first longitudinal surface and a second longitudinal surface opposite the first longitudinal surface, wherein the longitudinal beam has an I-shaped cross-section defining first and second recessed regions along opposite sides of the beam;
• a first side beam;
• a second side beam;
• a plurality of battery cells comprising:
• a first set of battery cells disposed between the first side beam and the first longitudinal surface of the longitudinal beam;
• a second set of battery cells disposed between the second side beam and the second longitudinal surface of the longitudinal beam, wherein each battery cell of the first set of battery cells and each battery cell of the second set of battery cells is characterized by:
• a first surface,
• a second surface opposite the first surface,
• a third surface extending vertically between the first surface and the second surface, wherein:
• the third surface faces the first recessed region of the longitudinal beam, and
• battery terminals extend from the third surface;
• and
• a fourth surface opposite the third surface;
• a lid coupled with the first surface of each battery cell of the plurality of battery cells;
• and
• a base coupled with the second surface of each battery cell of the plurality of battery cells.

A battery pack comprising:

• a longitudinal beam characterized by a first longitudinal surface and a second longitudinal surface opposite the first longitudinal surface, wherein the longitudinal beam has an I-shaped cross-section defining first and second recessed regions along opposite sides of the beam;
• a plurality of battery cells comprising:
• a first set of battery cells disposed adjacent the first longitudinal surface of the longitudinal beam;
• a second set of battery cells disposed adjacent the second longitudinal surface of the longitudinal beam, wherein each battery cell of the first set of battery cells and each battery cell of the second set of battery cells is characterized by:
• a first surface,
• a second surface opposite the first surface,
• a third surface extending vertically between the first surface and the second surface, wherein:
• the third surface faces the first recessed region of the longitudinal beam, and
• battery terminals extend from the third surface;
• and
• a fourth surface opposite the third surface;
• a lid coupled with the first surface of each battery cell of the plurality of battery cells;
• and
• a base coupled with the second surface of each battery cell of the plurality of battery cells, wherein the base defines a plurality of heat exchange fluid channels within the base.