Heat insulating material for battery packs and method for producing same

Abstract

This heat insulating material for battery packs includes a pressure-molded body (1) of a composition containing a powder of a porous structure, in which a plurality of primary particles are connected to form skeletal structures and pores are formed between the skeletal structures. The porous structure is produced by a sol-gel reaction of a solution having two or more kinds of silane compounds having mutually different numbers of siloxane bonds, and the powder of the porous structure is composed of particles (10) that are different in shape and size and are obtained by crushing the porous structure. The content of the powder of the porous structure in the composition is 65 mass% or more when the solid content in the composition is 100 mass %, and the porosity of the pressure-molded body (1) is 20% or less.