Metal-resin composite and method for producing the same
A battery includes a unit member in which a positive-electrode resin member made of resin is joined to each of a lid and a positive terminal member, which are made of metal. The lid and the positive terminal member are formed, on respective surfaces, with protrusions that have an average diameter of less than 1 μm on a nano-order and are arranged in a densely reticulated arrangement. The resin forming the positive-electrode resin member intrudes into each gap between at least distal ends of the adjacent protrusions, so that the positive-electrode resin member is joined to at least the distal ends of the protrusions.
1 . A metal-resin composite, comprising:
a metal member; and
a resin member directly joined to the metal member, wherein
the metal member has a surface on which protrusions are formed with an average diameter of less than 1 μm on a nanometer order and arranged adjacent to and spaced from one another,
resin that forms the resin member intrudes into each gap between distal ends of the adjacent protrusions of the metal member so that the resin member is joined to at least the distal ends of the protrusions of the metal member,
the protrusions are formed on a plurality of recesses that are two-dimensionally continuous in a grid pattern, and arranged at intervals to be adjacent to and spaced from one another by a distance equal to or less than an average diameter of the protrusions, and
the resin intrudes into a gap between proximal ends of the adjacent protrusions of the metal member so that the resin member is joined to the proximal ends of the protrusions of the metal member.
2 . A method for producing the metal-resin composite according to claim 1 , the method comprising:
forming the protrusions on the surface of the metal member by irradiating the metal member with a laser; and
after forming the protrusions, insert-molding the resin member in a region where the protrusions are formed on the surface of the metal member.