Buffer for battery

The present invention provides a battery cushion material that suppresses a dramatic increase in reaction force even when the compression ratio is large, and that maintains heat-insulating performance. This battery cushion (100) is disposed between adjacent members constituting a battery, is a sheet-like structure made of an elastic material, and has front surface-side protrusions (21) extending toward a front surface (11) and rear surface-side protrusions (22) extending toward a rear surface (13). The front-surface-side protrusions (21) and the rear-surface-side protrusions (22) have a hollow cone shape or a hollow ball section shape, and are flattened when an external force accompanying the expansion of the member is applied to the front-surface-side protrusions (21) and the rear-surface-side protrusions (22). 本发明提供一种即使在压缩率大的情况下也抑制反作用力的剧增，并且维持隔热性能的电池用缓冲件。本发明的电池用缓冲件(100)是配置于构成电池的相邻的构件之间的缓冲件，电池用缓冲件(100)为由弹性材料构成的片状的结构体，并具有向表面(11)侧延伸的表面侧凸部(21)和向背面(13)侧延伸的背面侧凸部(22)，表面侧凸部(21)和背面侧凸部(22)为中空的锥体状或中空的球截状，在施加伴随着上述构件的膨胀