Packaging material for power storage device, and method of producing packaging material for power storage device
AssigneeToppan Printing Co., Ltd.
InventorsWataru Ijuin, Satoshi Sasaki
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Abstract
A packaging material for a power storage device having a structure including at least a substrate layer, an adhesive layer, a metal foil layer, a sealant adhesive layer, and a sealant layer laminated in this order. In the packaging material, the substrate layer is formed of a polyester film having a 50% elongation stress in the range of 100 to 180 MPa and a thermal shrinkage in the range of 1 to 15%, after heat treatment from 160° C. to 200° C., or a polyester film having a difference ΔA in break elongation of 12% or more after heat treatment at 200° C. and 160° C. and having a 50% elongation stress of 75 MPa or more after heat treatment at 200° C.
Claims12
A packaging material for a power storage device comprising:
- a structure including a substrate layer, an adhesive layer, a metal foil layer, a sealant adhesive layer, and a sealant layer laminated in this order,
- wherein the substrate layer comprises a polyester film having a 50% elongation stress in a range of 100 to 180 MPa and a thermal shrinkage in a range of 1% to 15%, after heat treatment in a range of 160° C. to 200° C.;
- wherein the 50% elongation stress is an average of stresses resulting from tensile tests (test piece shape:
- dumbbell No. 5 according to JIS K7127;
- length between chucks:
- 75 mm;
- gauge length:
- 25 mm;
- test speed:
- 50 mm/min;
- temperature:
- 23° C.) in four directions (0° (MD), 45°, 90° (TD), 135°) of the substrate layer;
- and
- wherein the thermal shrinkage is an average of shrinkages before and after heat treatment in four directions (0° (MD), 45°, 90° (TD), 135°) of the substrate layer.
A packaging material for a power storage device comprising:
- a structure including a substrate layer, an adhesive layer, a metal foil layer, a sealant adhesive layer, and a sealant layer laminated in this order,
- wherein the substrate layer comprises a polyester film having ΔA of 12% or more expressed by Formula (1) below and having a 50% elongation stress of 75 MPa or more after heat treatment at 200° C.:
- ΔA=(break elongation after 200° C. heat treatment)−(break elongation after 160° C. heat treatment) (Formula (1)),
- and, wherein the break elongation and the 50% elongation stress are each an average at 23° C. resulting from tensile tests (test piece shape:
- dumbbell No. 5 according to JIS K7127, length between chucks:
- 75 mm, gauge length:
- 25 mm, test speed:
- 50 mm/min) in four directions (0° (MD), 45°, 90° (TD), 135°) of the substrate layer.
Dependencies are inferred from the claim text.