Metal member, metal-resin composite, method for producing the metal member, and method for producing the metal-resin composite

Abstract

A metal member (a lid member and a positive terminal member) has a surface with a joining region to be joined to a resin member (a positive-electrode resin member) to seal between the first space and the second space (outside and inside of a battery) in combination with the resin member. The joining region includes a roughened region formed on the surface and constituted of a base layer composed of accumulated debris particles, and a column group layer composed of nano columnar bodies standing densely in two dimensions, each being formed of the debris particles bonding to one another like strings of beads extending in the height direction from the base layer. The nano columnar bodies in the resin member have an average height of 84 nm or more.

Dependencies are inferred from the claim text.