Heat insulation sheet, method for producing same, and secondary battery in which same is used

Patent metadata

Field	Value
Publication number	US-2019190098-A1
Application number	US-201716326695-A
Country	US
Kind code	A1
Filing date	Oct 11, 2017
Priority date	Dec 12, 2016
Publication date	Jun 20, 2019
Grant date	—

Abstract

A heat insulation sheet includes a fiber sheet, a resin layer provided on a surface of an outer peripheral portion of the fiber sheet, and a silica xerogel disposed in spaces of the fiber sheet. The fiber sheet includes fibers forming spaces among the fibers. The resin layer is denser than the fiber sheet and made of thermoplastic resin. The silica xerogel is held in the plurality of fibers. This heat insulation sheet is excellent in adhesiveness, and is easily attached to a protective sheet or a frame to be fixed.

First claim

1 . A heat insulation sheet comprising:
a fiber sheet including fibers forming spaces among the fibers; a resin layer provided on a surface of an outer peripheral portion of the fiber sheet, the resin layer being denser than the fiber sheet and made of thermoplastic resin; and a silica xerogel disposed in the spaces of the fiber sheet to be held in the plurality of fibers.

2 . The heat insulation sheet of claim 1 , wherein a thickness of the resin layer is equal to or larger than 2% of a thickness of the fiber sheet and is equal to or smaller than 20% of the thickness of the fiber sheet.

3 . The heat insulation sheet of claim 1 , wherein the resin layer disables liquid to pass through the resin layer.

4 . A method for producing a heat insulation sheet, comprising:
preparing a base material sheet including
a fiber sheet including fibers forming spaces among the fibers, and
a resin layer provided on a surface of an outer peripheral portion of the fiber sheet, the resin layer being denser than the fiber sheet and made of thermoplastic resin; and
obtaining a heat insulation sheet by impregnating the spaces of the fiber sheet with xerogel.

5 . The method of claim 4 , wherein said preparing the base material sheet comprises heating and pressing the base material sheet at a temperature at which the resin layer is softened so as to form the resin layer on the surface of the outer peripheral portion of the fiber sheet.

6 . The method of claim 5 , wherein said preparing the base material sheet comprises heating and pressing the base material sheet at a temperature at which the resin layer is melted so as to form the resin layer on the surface of the outer peripheral portion of the fiber sheet.

7 . The method of claim 4 , wherein said obtaining the heat insulation sheet comprises immersing the base material sheet in sol to impregnate the spaces of the fiber sheet with the xerogel.

8 . The method of claim 7 , wherein the fir resin layer disables the sol to pass through the resin layer.

9 . A secondary battery comprising:
a plurality of battery cells; and a separator disposed between the plurality of battery cells, wherein the separator includes a heat insulation sheet and a frame fixed to an outer peripheral portion of the heat insulation sheet, and wherein the heat insulation sheet includes:
a fiber sheet including fibers forming spaces among the fibers;
a resin layer provided on a surface of the outer peripheral portion of the fiber sheet and fixed to the frame, the resin layer being denser than the fiber sheet and made of thermoplastic resin; and
silica xerogel disposed in the spaces of the fiber sheet to be held in the plurality of fibers.

10 . The secondary battery of claim 9 , further comprising a housing that accommodates and fixes the plurality of battery cells and the separator.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Abe Yuuichi

Classifications

• H01M10/658 Primary

  by thermal insulation or shielding · CPC title

• B32B2457/10

  Batteries · CPC title

• B32B37/15

  with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state · CPC title

• B32B2307/304

  Insulating · CPC title

• H01M10/6555

  arranged between the cells · CPC title