Laminate and method for using laminate
The present invention provides a laminate that has excellent flame-shielding performance and heat-shielding performance and can reduce the transmission of flame and heat generated by ignition inside a battery to the outside, especially when used as a cover for an in-vehicle battery. Provided is a laminate including: a fiber layer including a resin and a fiber; and a thermal insulation layer formed on at least one surface of the fiber layer.
1 . A laminate comprising:
a fiber layer including a resin and a fiber; and
a thermal insulation layer formed on at least one surface of the fiber layer, wherein the laminate has a thermal conductivity after heating at 800° C. for one minute of 0.01 to 0.15 W/mK, and
the resin constituting the fiber layer has an oxygen index of 20 or greater.
2 . The laminate according to claim 1 ,
wherein a rate of change of thermal conductivity after heating at 800° C. for one minute, represented by the following formula (1), is 1 to 10:
(Rate of change of thermal conductivity)=[(Thermal conductivity before heating)−(Thermal conductivity after heating)]/(Thermal conductivity after heating) (1).
3 . The laminate according to claim 1 ,
wherein a rate of volume expansion, represented by the following formula (3), after heating at 800° C. for one minute is 2 times or greater:
(Rate of volume expansion)=[(Maximum thickness after heating)−(Thickness before heating)]/(Thickness before heating) (3).
4 . The laminate according to claim 1 , further comprising, on a surface of the thermal insulation layer opposite to the surface facing the fiber layer, a fiber layer including a resin and a fiber.
5 . The laminate according to claim 1 ,
wherein the resin constituting the fiber layer is a chlorinated polyvinyl chloride resin having an average degree of polymerization of 400 to 3,000 and a chlorine content of 57 to 72% by mass.
6 . The laminate according to claim 1 ,
wherein the fiber constituting the fiber layer is at least one selected from the group consisting of a glass fiber and a carbon fiber.
7 . The laminate according to claim 1 ,
wherein an amount of the fiber in the fiber layer is 10 to 80% by mass.
8 . The laminate according to claim 1 , which is a cover for a lithium-ion battery.
9 . A method for using the laminate according to claim 1 as a cover for a lithium-ion battery.
10 . A laminate comprising:
a fiber layer including a resin and a fiber; and
a thermal insulation layer formed on at least one surface of the fiber layer, wherein a rate of change of thermal conductivity after heating at 800° C. for one minute, represented by the following formula (1), is 1 to 10:
(Rate of change of thermal conductivity)=[(Thermal conductivity before heating)−(Thermal conductivity after heating)]/(Thermal conductivity after heating) (1).
11 . A laminate comprising:
a fiber layer including a resin and a fiber; and
a thermal insulation layer formed on at least one surface of the fiber layer,
wherein a rate of volume expansion, represented by the following formula (3), after heating at 800° C. for one minute is 2 times or greater:
(Rate of volume expansion)=[(Maximum thickness after heating)−(Thickness before heating)]/(Thickness before heating) (3).
12 . A laminate comprising:
a fiber layer including a resin and a fiber; and
a thermal insulation layer formed on at least one surface of the fiber layer,
wherein the resin constituting the fiber layer is a chlorinated polyvinyl chloride resin having an average degree of polymerization of 400 to 3,000 and a chlorine content of 57 to 72% by mass.