SECONDARY BATTERY MODULE

The present disclosure relates to a secondary battery module including a secondary battery stack including a plurality of secondary batteries stacked on each other, each secondary battery having two longer side portions and two shorter side portions respectively connecting two ends of the longer side portions, the secondary battery module including a foam pad inserted between adjacent secondary batteries in the secondary battery stack, wherein the foam pad includes a body made of a material having flexibility and having an accommodation portion which is an enclosed internal space; and a working fluid injected into the accommodation portion, and wherein the accommodation portion is deformed by a pressure applied from the secondary battery and the working fluid flows in the accommodation portion.