Battery housing

A battery comprising:

• a base;
• a first end wall, a second end wall, a first side wall, and a second side wall formed with the base and defining a volume;
• a cell wall formed with the base, the first side wall, and the second side wall, the cell wall separating a first battery cell from a second battery cell;
• a cover enclosing the volume, the cover defining a common headspace;
• and
• a first battery element and a second battery element disposed in the first battery cell and the second battery cell, respectively, the first battery element having a first side edge and a second side edge, the second battery element having a third side edge and a fourth side edge,
• portions of the first side wall, the first side edge, and the cell wall defining a first gap,
• portions of the second side wall, the second side edge, and the cell wall defining a second gap,
• portions of the first side wall, the third side edge, and the cell wall defining a third gap, and
• portions of the second side wall, the fourth side edge, and the cell wall defining a fourth gap, each of the first gap, second gap, third gap, and fourth gap being fluidly coupled by the common headspace between the first battery cell and the second battery cell.