BATTERY ASSEMBLY AND METHOD OF MANUFACTURING SAME

A battery assembly (1) includes: a plurality of battery cells (100) arranged in a first direction; a separator (200) disposed between the plurality of battery cells (100); a restraint member (300) that restrains the plurality of battery cells (100) and the separator (200) along the first direction, wherein the separator (200) includes a first member (210) including a base portion (211) and a plurality of protrusions (212) each protruding from the base portion (211) in the first direction, and a second member (220) disposed between the plurality of protrusions (212), the second member (220) having a higher heat insulation property than a heat insulation property of the first member (210), the second member (220) being more likely to be deformed than the first member (210).