EXTERIOR MATERIAL FOR POWER STORAGE DEVICE, MANUFACTURING METHOD THEREOF, AND POWER STORAGE DEVICE

Provided is an exterior material for a power storage device, which has an excellent ability to distinguish an identification mark printed on a surface in a yellow room, even when the exterior material has a black appearance. The exterior material for a power storage device is configured by a laminate including at least a base material layer, a barrier layer, and a thermally fusible resin layer in this order from the outside, wherein as one embodiment, an adhesive layer containing a predetermined colorant is disposed between the base material layer and the barrier layer, so that a b* value in an L*a*b* color space of reflected light measured from the outside of the laminate is set to -0.20 or less under a measurement condition of the SCI method, a visual field of 10 DEG, and a light source F2. 本发明提供一种蓄电装置用外包装材料，虽然其是外观呈现黑色的蓄电装置用外包装材料，但在黄色室内，印刷在表面的识别标识的识别性优异。上述蓄电装置用外包装材料由从外侧依次至少具备基材层、阻隔层和热熔接性树脂层的叠层体构成，作为一个实施例，通过在上述基材层与上述阻隔层之间配置含有规定着色剂的粘接剂层，使从上述叠层体的外侧测定的反射光在L*a*b*色空间中的b*值以SCI方式、在视野10°和光源F2的测定条件下，能够为－0.20以下。