Power supply device, and electric vehicle and power storage device that comprise said power supply device

Abstract

A power supply device includes a battery block in which a plurality of battery cells is stacked in a thickness with separator clamped therebetween, a pair of end plates disposed on opposing end faces of the battery block, and a binding bar coupled to the pair of end plates and fixing the battery block in a compressed state via the end plates, in order to absorb expansion of the battery cells with the separator and suppress degradation of the separator in a state of being heated by the battery cells. Separator has a three-layer structure including viscoelastic elastic sheet that absorbs expansion of battery cell and heat-insulating sheets laminated on opposing surfaces of elastic sheet, and heat-insulating sheet is hybrid material of an inorganic powder and a fibrous reinforcing material.