JP2021093375A5 - - Google Patents

Claims (17)

An exterior material for an electricity storage device, comprising at least a laminate comprising, in order from the outside, a substrate layer, a barrier layer, and a heat-fusible resin layer,
The power storage device exterior material is molded so as to protrude from the heat-fusible resin layer side to the base layer side, and has a recessed portion in which the power storage device element is accommodated on the heat-fusible resin layer side. and
For the curved surface portion and the non-curved surface portion of the outer surface forming the recess of the power storage device exterior material, under the measurement conditions of the SCI method, the field of view of 10°, and the light source F2, the reflected light in the L ^* a ^* b ^* color space is measured. An exterior material for an electricity storage device, wherein the absolute value of the difference between the L ^* value of the curved surface portion and the L ^* value of the non-curved surface portion is 1.5 or less when the L ^* value is measured. An exterior material for an electricity storage device, comprising at least a laminate comprising, in order from the outside, a substrate layer, a barrier layer, and a heat-fusible resin layer,
The power storage device exterior material is molded under the following molding conditions so as to protrude from the heat-fusible resin layer side to the base layer side, and the power storage device element is formed on the heat-fusible resin layer side. For the curved surface portion and the non-curved surface portion of the outer surface forming the concave portion to be accommodated and forming the concave portion of the power storage device exterior material, the L An electricity storage device, wherein the absolute value of the difference between the L ^* value of the curved surface portion and the L ^* value of the non-curved surface portion is 1.5 or less when the L ^* value in the ^* a ^* b ^* color space is measured. exterior material.
(Molding condition)
Between a molding die (female mold) having a diameter of 54.5 mm (TD) x 31.6 mm (MD) and a corresponding molding die (male mold), an exterior material for an electric storage device is placed, and the female mold side is It is arranged so as to be on the base material layer side, and cold molding is performed with a pressing pressure (surface pressure) of 0.25 MPa and a molding depth of 3.0 mm to form a recess rectangular in plan view. The clearance between the female and male molds is 0.5 mm. The surface of the female mold has a maximum height roughness (nominal value of Rz) of 0.8 μm as specified in Table 2 of JIS B 0659-1: 2002 Annex 1 (Reference) Comparative Surface Roughness Standard Piece . The corner R of the female mold is 2.0 mm and the ridge R is 2.5 mm. The surface of the male mold has a maximum height roughness (nominal value of Rz) of 3.2 μm as specified in Table 2 of JIS B 0659-1: 2002 Annex 1 (reference) Comparative surface roughness standard piece . The corner R of the male mold is 2.0 mm and the ridge R is 2.0 mm. The male corner R and ridge R are specified in JIS B 0659-1: 2002 Annex 1 (reference) Table 2 of the surface roughness standard piece for comparison, the maximum height roughness (nominal value of Rz) is 1 .6 μm. 3. The power storage device exterior material according to claim 1, wherein said power storage device exterior material is provided with a surface coating layer on the outside of said base material layer. The power storage device exterior material includes an adhesive layer between the base layer and the barrier layer,
4. The exterior material for an electricity storage device according to claim 1, wherein said adhesive layer is colored. The power storage device exterior material according to any one of claims 1 to 4, wherein two or more types of lubricants are present on at least one of the surface and the interior of the base material layer. At least one of the surface and the inside of the base material layer is selected from the group consisting of saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, methylolamides, saturated fatty acid bisamides, unsaturated fatty acid bisamides, fatty acid ester amides and aromatic bisamides. The exterior material for an electricity storage device according to any one of claims 1 to 5, wherein at least two types of the material are present. The exterior material for an electricity storage device according to any one of claims 1 to 6, wherein the barrier layer includes at least one of an aluminum alloy foil and a stainless steel foil. The power storage device exterior material according to any one of claims 1 to 7, wherein two or more kinds of lubricants are present on at least one of the surface and the inside of the heat-fusible resin layer. At least one of the surface and the inside of the heat-sealable resin layer is composed of saturated fatty acid amide, unsaturated fatty acid amide, substituted amide, methylolamide, saturated fatty acid bisamide, unsaturated fatty acid bisamide, fatty acid ester amide, and aromatic bisamide. The exterior material for an electricity storage device according to any one of claims 1 to 8, wherein at least two selected from the group are present. The power storage device exterior material according to any one of claims 1 to 9, wherein the power storage device exterior material is colored. The power storage device exterior material according to any one of claims 1 to 10, wherein the power storage device exterior material comprises a colored layer between the base layer and the barrier layer. A surface coating layer is provided on the side opposite to the barrier layer side of the base material layer,
The power storage device exterior material according to any one of claims 1 to 11, wherein two or more kinds of lubricants are present on at least one of the surface and the inside of the surface coating layer. A surface coating layer is provided on the side opposite to the barrier layer side of the base material layer,
At least one of the surface and the inside of the surface coating layer is selected from the group consisting of saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, methylolamides, saturated fatty acid bisamides, unsaturated fatty acid bisamides, fatty acid ester amides and aromatic bisamides. 13. The exterior material for an electricity storage device according to any one of claims 1 to 12, wherein at least one type of the material is present. An electricity storage device, wherein an electricity storage device element comprising at least a positive electrode, a negative electrode, and an electrolyte is housed in a package formed by the exterior material for an electricity storage device according to any one of claims 1 to 13 . At least a step of obtaining an exterior material for an electricity storage device composed of a laminate in which a substrate layer, a barrier layer, and a heat-fusible resin layer are laminated in this order,
The power storage device exterior material is molded so as to protrude from the heat-fusible resin layer side to the base layer side, and has a recessed portion in which the power storage device element is accommodated on the heat-fusible resin layer side. and
For the curved surface portion and the non-curved surface portion of the outer surface forming the recess of the power storage device exterior material, L ^* a ^* b ^* L in color space ^* When the value is measured, the L of the curved surface portion ^* value and L of the non-curved portion ^* and the absolute value of the difference from is 1.5 or less. An adhesive layer is provided between the barrier layer and the heat-fusible resin layer,
The adhesive layer and the heat-fusible resin layer are formed by a coextrusion lamination method, a tandem lamination method, a thermal lamination method, a sandwich lamination method, or an adhesive for forming the adhesive layer on the barrier layer. 16. The method for manufacturing an exterior material for an electric storage device according to claim 15, wherein the heat-fusible resin layer formed in advance into a sheet is laminated on the adhesive layer. 17. The method of manufacturing an exterior material for an electricity storage device according to claim 15, wherein said heat-fusible resin layer is formed of two or more layers of the same or different resins.