Separator having heat-resistant insulating layer and electric device comprising the same

Patent metadata

Field	Value
Publication number	US-9728757-B2
Application number	US-201214129394-A
Country	US
Kind code	B2
Filing date	Jun 21, 2012
Priority date	Jun 28, 2011
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A separator having a heat-resistant insulating layer of the present invention includes a porous resin base layer and a heat-resistant insulating layer which is formed on one or both sides of the porous resin base layer and contains inorganic particles and a binder. The porous resin base layer contains a resin having a melting temperature of 120° C. to 200° C. The separator is configured so that the ratio of the basis weight of the heat-resistant insulating layer to the basis weight of the porous resin base layer is not less than 0.5. Accordingly, the separator having a heat-resistant insulating layer of the present invention exhibits excellent thermal shrinkage resistance while ensuring a shutdown function.

First claim

The invention claimed is:

1. A separator having a heat-resistant insulating layer, comprising:
a porous resin base layer; and
a heat-resistant insulating layer which is provided on at least one side of the porous resin base layer and contains inorganic particles and a binder,
wherein the porous resin base layer contains a resin having a melting temperature of 120° C. to 200° C.,
a ratio of basis weight of the heat-resistant insulating layer to basis weight of the porous resin base layer is not less than 1.3, and
a peel strength between the porous resin base layer and the heat-resistant insulating layer is 10 mN/mm or less.

2. The separator having a heat-resistant insulating layer according to claim 1 , wherein the ratio of the basis weight of the heat-resistant insulating layer to the basis weight of the porous resin base layer is not more than 2.0.

3. The separator having a heat-resistant insulating layer according to claim 1 , wherein peel strength between the porous resin base layer and the heat-resistant insulating layer is not less than 0.1 mN/mm.

4. The separator having a heat-resistant insulating layer according to claim 3 , wherein the peel strength is not less than 2.0 mN/mm.

5. The separator having a heat-resistant insulating layer according to claim 1 , wherein the inorganic particles include at least one selected from a group consisting of oxides, hydroxides, and nitrides of zirconium, aluminum, silicon, and titanium, and a mixture and a composite of the same.

6. The separator having a heat-resistant insulating layer according to claim 1 , wherein the material constituting the porous resin base layer includes at least one selected from a group consisting of polyethylene, polypropylene, and ethylene-propylene copolymer.

7. The separator having a heat-resistant insulating layer according to claim 1 , wherein the porous resin base layer includes at least one selected from a group consisting of woven fabric, non-woven fabric, and microporous membrane.

8. An electric device, comprising the separator having the heat-resistant insulating layer according to claim 1 .

9. The separator having a heat-resistant insulating layer according to claim 2 , wherein the inorganic particles include zirconia.

10. The separator having a heat-resistant insulating layer according to claim 1 , wherein the inorganic particles include silica.

Assignees

• Honda Takashi
• Hirai Tamaki
• Muramatsu Hironobu
• Nissan Motor

Inventors

• Honda Takashi
• Hirai Tamaki
• Muramatsu Hironobu

Classifications

• H01G11/52 Primary

  Separators · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/491

  Porosity · CPC title

• H01M50/454

  comprising a non-fibrous layer and a fibrous layer superimposed on one another · CPC title