Heat insulating member and battery cover
A heat insulating member includes a wall member. The wall member includes a high-density portion provided at one end edge in a direction orthogonal to a thickness direction of the wall member and having density of above 0.45 g/cm 3 and a low-density portion provided midway in the direction orthogonal to the thickness direction, having heat-insulating properties, and having density of 0.45 g/cm 3 or less. The high-density portion is provided over the entire one end edge and the thickness of the high-density portion is thinner than that of the low-density portion.
1. A heat insulating member comprising a wall member, wherein
the wall member includes
a high-density portion provided at one end edge in a direction orthogonal to a thickness direction of the wall member and having density of above 0.45 g/cm 3 and
a low-density portion provided midway in the direction orthogonal to the thickness direction, having heat-insulating properties, and having density of 0.45 g/cm 3 or less, and
the high-density portion is provided over the entire one end edge and
the thickness of the high-density portion is thinner than that of the low-density portion.
2. The heat insulating member according to claim 1 , wherein
the high-density portion includes a compressed portion and an air barrier layer provided on at least one side face in a thickness direction of the compressed portion and
the low-density portion includes a foam portion and an air barrier layer provided on at least one side face in a thickness direction of the foam portion.
3. The heat insulating member according to claim 2 , wherein the air barrier layer is a resin-impregnated nonwoven fabric including a nonwoven fabric and a resin impregnated into the nonwoven fabric.
4. The heat insulating member according to claim 3 , wherein the compressed portion is impregnated with the resin.
5. The heat insulating member according to claim 2 , wherein an adhesive is provided between the compressed portion and the foam portion, and the air barrier layer.
6. The heat insulating member according to claim 2 , wherein the compressed portion is a compressed body obtained by compressing foam and the foam portion is the foam.
7. A battery cover comprising:
side walls covering four side faces of a battery, wherein
at least one side wall is the wall member described in claim 1 .
8. The battery cover according to claim 7 further including a spacer provided at the high-density portion for providing a space between the battery and the side walls.