Battery packaging material including substrate protective layer

1 . A battery packaging material comprising:

a substrate layer;

a heat-fusible resin layer;

a barrier layer arranged between the substrate layer and the heat-fusible resin layer; and

a substrate protective layer as an outermost layer arranged on an outer side of the substrate layer such that the substrate layer is arranged between the substrate protective layer and the barrier layer,

wherein the substrate protective layer includes

a binder resin, and

solid fine particles including wax, resin beads and inorganic fine particles,

wherein the wax having an average particle diameter greater than a thickness of the substrate protective layer, and

wherein a gross value of a surface of the substrate protective layer is 1% to 5%.

2 . The battery packaging material as recited in claim 1 ,

wherein an average particle diameter of the wax is 5 μm to 20 μm, an average particle diameter of the resin beads is 1 μm to 10 μm, and an average particle diameter of the inorganic fine particles is 1 μm to 10 μm, and

wherein a total content rate of the wax, the resin beads, and the inorganic fine particles in the substrate protective layer is 30 mass % to 50 mass %.

3 . The battery packaging material as recited in claim 1 ,

wherein the wax is at least one type of wax selected from the group consisting of polyethylene wax, polypropylene wax, and polytetrafluoroethylene wax.

4 . The battery packaging material as recited in claim 1 ,

wherein the resin beads are at least one type of resin beads selected from the group consisting of acrylic resin beads, urethane resin beads, polyethylene resin beads, polystyrene resin beads, silicone resin beads, and fluorocarbon resin beads.

5 . The battery packaging material as recited in claim 1 ,

wherein the inorganic fine particles are at least one type of inorganic fine particles selected from the group consisting of silica, alumina, kaolin, calcium oxide, calcium carbonate, calcium sulfate, barium sulfate, and calcium silicate.

6 . The battery packaging material as recited in claim 1 ,

wherein the binder resin is at least one type of a resin selected from the group consisting of an acryl-based resin, a urethane-based resin, a polyolefin-based resin, a phenoxy-based resin, a polyester-based resin, and a tetrafluoroolefin-based resin.

7 . The battery packaging material as recited in claim 1 ,

wherein at least one of the substrate protective layer and the substrate layer contains a coloring agent.

8 . The battery packaging material as recited in claim 1 ,

wherein the barrier layer and the substrate layer are laminated via an adhesive layer, and at least one of the substrate protective layer, the substrate layer, and the adhesive layer includes a coloring agent.

9 . The battery packaging material as recited in claim 1 ,

wherein a colored layer is provided at least one of between the substrate protective layer and the substrate layer and between the substrate layer and the barrier layer.

10 . The battery packaging material as recited in claim 1 ,

wherein the barrier layer and the substrate layer are laminated via an adhesive layer, and

wherein a colored layer is provided at least one of between the substrate protective layer and the substrate layer, between the substrate layer and the adhesive layer, and between the adhesive layer and the barrier layer.

11 . The battery packaging material as recited in claim 1 ,

wherein an average particle diameter of the resin beads is equal to a thickness of the substrate protective layer.

12 . The battery packaging material as recited in claim 1 ,

wherein the inorganic fine particles include at least one of barium sulfate, silica, and alumina.

13 . The battery packaging material as recited in claim 12 ,

wherein a content rate of the barium sulfate is 9 mass % to 33 mass %.

14 . The battery packaging material as recited in claim 12 ,

wherein a content rate of the silica or the alumina is 5 mass % to 20 mass %.

15 . A battery packaging material comprising:

a substrate layer;

a heat-fusible resin layer;

a barrier layer arranged between the substrate layer and the heat-fusible resin layer; and

a substrate protective layer as an outermost layer arranged on the substrate layer such that the substrate layer is arranged between the substrate protective layer and the barrier layer, the substrate protective layer comprising:

a binder resin, and

solid fine particles comprising:

wax having an average particle diameter greater than a thickness of the substrate protective layer;

resin beads; and

inorganic fine particles.

16 . The battery packaging material as recited in claim 15 ,

wherein an average particle diameter of the resin beads is equal to a thickness of the substrate protective layer.