Battery module with improved frame structure and frame assembly for the battery module

A battery module, comprising:

• (1) a cell assembly including a plurality of cells adjacently arranged along a length direction;
• and
• (2) a frame assembly having
• (2a) a bottom plate supporting the cell assembly from a lower portion,
• (2b) a side plate perpendicular to the bottom plate and extending in the length direction to be in direct contact with the cells at an outermost side of the cell assembly, and
• (2c) a top plate covering an upper portion of the cell assembly,
• wherein an external air inflow space is provided in the length direction between the side plate and the cell assembly, and
• wherein the external air inflow space has ends open to an outside of the battery module such that an entirety of a flow path through the external air inflow space between the ends is straight.