JPWO2021251017A5

JPWO2021251017A5 -

Info

Publication number: JPWO2021251017A5
Application number: JP2022530054A
Authority: JP
Filing date: 2021-04-26
Publication date: 2024-04-26

Description

本発明の第１の形態に係る断熱シートによれば、中間層と、前記中間層の表面に積層された表面層と、を備える断熱シートであって、前記中間層の、厚さ方向の熱伝導率が、０．５０Ｗ／ｍ・Ｋ以下であり、前記表面層の、厚さ方向の熱伝導率が、１．００Ｗ／ｍ・Ｋ以上であり、変形可能な柔軟性を備えており、前記断熱シートを接触させる対象物の変形に追従して密着状態を維持可能としている。上記構成により、絶縁シートを、表面層を熱伝導率を高めた放熱層とし、中間層を断熱性を高めた断熱層とした多層構造とすることで、表面層を断熱対象物側として高い放熱性能によってホットスポットの発生を抑制しつつ、背面側には断熱性能を高めた中間層を配置して、隣接する他の部材への熱伝導を阻止して類焼の発生を抑制することが可能となる。また、断熱シートを接触させる対象物が膨張する等変形しても、その変形に追従して密着状態を維持でき、空隙が形成されて熱伝導性が低下する事態を回避できる。
According to the first embodiment of the present invention, the heat insulating sheet includes an intermediate layer and a surface layer laminated on the surface of the intermediate layer, the intermediate layer having a thermal conductivity in the thickness direction of 0.50 W/m·K or less, the surface layer having a thermal conductivity in the thickness direction of 1.00 W/m·K or more , and having deformable flexibility, and capable of maintaining a close contact state by following the deformation of the object with which the heat insulating sheet is in contact . With the above configuration, the insulating sheet has a multi-layer structure in which the surface layer is a heat dissipation layer with increased thermal conductivity and the intermediate layer is a heat insulating layer with increased thermal insulation, so that the surface layer is on the side of the object to be insulated and suppresses the occurrence of hot spots by its high heat dissipation performance, while the intermediate layer with increased thermal insulation performance is disposed on the back side, making it possible to prevent heat conduction to other adjacent members and suppress the occurrence of spreading fire. In addition, even if the object with which the heat insulating sheet is in contact is deformed due to expansion or the like, the heat insulating sheet can maintain a close contact state by following the deformation, and it is possible to avoid a situation in which a void is formed and the thermal conductivity is reduced.

さらにまた、本発明の第１２の形態に係る断熱シートによれば、複数のパウチ型二次電池セルを積層した電源装置に用いる断熱シートであって、中間層と、前記中間層の表面にそれぞれ積層された表面層と、を備え、前記中間層の、厚さ方向の熱伝導率が、０．５０Ｗ／ｍ・Ｋ以下であり、前記表面層の、厚さ方向の熱伝導率が、１．００Ｗ／ｍ・Ｋ以上であり、変形可能な柔軟性を備えており、前記断熱シートを接触させる対象物の変形に追従して密着状態を維持している。上記構成により、絶縁シートを、表面層をそれぞれ熱伝導率を高めた放熱層とし、間の中間層を断熱性を高めた断熱層とした多層構造とすることで、各表面層をパウチ型二次電池セルに対向させて高い放熱性能によってホットスポットの発生を抑制しつつ、これら表面層の間には断熱性能を高めた中間層を配置して、隣接する他のパウチ型二次電池セルへの熱伝導を阻止して類焼の発生を抑制することが可能となる。また、断熱シートを接触させる対象物が膨張する等変形しても、その変形に追従して密着状態を維持でき、空隙が形成されて熱伝導性が低下する事態を回避できる。 Furthermore, according to a twelfth embodiment of the present invention, there is provided an insulating sheet for use in a power supply device in which a plurality of pouch-type secondary battery cells are stacked, the insulating sheet comprising an intermediate layer and surface layers respectively stacked on the surfaces of the intermediate layer, the intermediate layer having a thermal conductivity in the thickness direction of 0.50 W/m·K or less, the surface layer having a thermal conductivity in the thickness direction of 1.00 W/m·K or more , and having deformable flexibility, and maintaining a tight contact state by following the deformation of an object with which the insulating sheet is in contact . With the above configuration, the insulating sheet has a multi-layer structure in which each surface layer is a heat dissipation layer with enhanced thermal conductivity and the intermediate layer between them is a heat insulating layer with enhanced thermal insulation, so that each surface layer faces the pouch-type secondary battery cell to suppress the occurrence of hot spots by their high heat dissipation performance, while an intermediate layer with enhanced thermal insulation performance is disposed between these surface layers to prevent heat conduction to other adjacent pouch-type secondary battery cells to suppress the occurrence of spreading fire. Furthermore, even if the object with which the heat insulating sheet comes into contact expands or deforms, the sheet can follow the deformation and maintain a tight fit, thereby preventing the formation of voids that would reduce thermal conductivity.

Claims

The middle class,
a surface layer laminated on a surface of the intermediate layer;
A heat insulating sheet comprising :
The intermediate layer has a thermal conductivity in a thickness direction of 0.50 W/m K or less,
The thermal conductivity of the surface layer in the thickness direction is 1.00 W/m K or more;
The heat insulating sheet has deformable flexibility and can maintain a tight contact state by following the deformation of an object with which the heat insulating sheet is in contact .

The heat insulating sheet according to claim 1,
The heat insulating sheet is formed by laminating the surface layers on both sides of the intermediate layer.

The heat insulating sheet according to claim 1 or 2 ,
The surface layer of the heat insulating sheet comprises fibers or a thermally conductive filler.

The heat insulating sheet according to any one of claims 1 to 3 ,
The intermediate layer comprises at least one of a fiber, a filler, and a binder.

The heat insulating sheet according to any one of claims 1 to 4 ,
The heat insulating sheet has an adhesive layer that bonds the intermediate layer and the surface layer together, the adhesive layer being at least one of an acrylic adhesive, a vinyl chloride adhesive, a vinyl acetate adhesive, and a hot melt adhesive.

The heat insulating sheet according to any one of claims 1 to 5 ,
The heat insulating sheet has a thickness of 0.2 mm to 6.0 mm.

The heat insulating sheet according to any one of claims 1 to 6 ,
The thermal insulation sheet, wherein the thermal conductivity of the surface layer in the plane direction is 1000 W/m·K or less.

The heat insulating sheet according to any one of claims 1 to 7 ,
A heat insulating sheet, wherein the thermal conductivity of the surface layer in the thickness direction is 3.00 W/m·K or less.

The heat insulating sheet according to any one of claims 1 to 8 ,
A heat insulating sheet having an ashing area on the back surface ^{of 500} mm2 or less when heated for 10 minutes in accordance with the JIS L 1091 A-1 (1999) test.

The heat insulating sheet according to any one of claims 1 to 9 ,
A heat insulating sheet, wherein the thermal conductivity of the surface layer in the planar direction is at least 5 times the thermal conductivity in the thickness direction.

A heat insulating sheet for use in a power supply device in which a plurality of pouch-type secondary battery cells are stacked,
The middle class,
a surface layer laminated on each surface of the intermediate layer;
Equipped with
The intermediate layer has a thermal conductivity in a thickness direction of 0.50 W/m K or less,
The thermal conductivity of the surface layer in the thickness direction is 1.00 W/m K or more;
The heat insulating sheet has deformable flexibility and maintains a tight contact state by following the deformation of an object with which the heat insulating sheet is in contact .

The heat insulating sheet according to claim 11 ;
a plurality of pouch-type secondary battery cells stacked with the heat insulating sheet interposed therebetween;
A power supply device comprising: