Battery and lead-insulating film

Patent metadata

Field	Value
Publication number	US-10256440-B2
Application number	US-30390805-A
Country	US
Kind code	B2
Filing date	Dec 19, 2005
Priority date	Jan 18, 2001
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

A lithium battery (1) has a battery module (2), a battery package (5) for holding the battery module (2) therein, and leads (4) extending from the battery module (2) and projecting outside from the battery package (5). The battery package (5) is formed from a laminated sheet (10), and a peripheral part (9) of the battery package (5) is heat-sealed. Lead-insulating films (6) are interposed between the peripheral part (9) of the package (5) and the leads (4). Each of the lead-insulating films includes a heat-resistant base film (22), a polyolefin resin layer (21) formed on one of the surfaces of the base film (22) on the side of the laminated sheet (10), and an acid-modified polyolefin resin layer (23) formed on the other surface of the base film (22) on the side of the lead (4).

First claim

What is claimed is:

1. A battery, comprising:
a battery module;
a battery package for holding the battery module; and
leads extending from the battery module and projecting outwardly from the battery package;
wherein:
the battery package is formed from a laminated sheet;
a peripheral part of the battery package is heat-sealed;
lead-insulating films are interposed between the peripheral part of the package and the leads;
each of the lead-insulating films comprises a heat-resistant base film, a first resin layer formed on a first surface of the heat-resistant base film through a first anchor coating, a second resin layer formed on a second surface of the heat-resistant base film opposite from the first surface through a second anchor coating, each of the first and second resin layers being formed on the heat-resistant base film by an extrusion lamination process; and
the heat-resistant base film is formed of a polyethylene naphthalate resin.

2. The battery according to claim 1 , wherein:
the first resin layer is provided on a laminated sheet-side of the heat-resistant base film and the second resin layer is provided on a lead-side of the heat-resistant base film; and
the first resin layer is formed of a polyolefin resin and the second resin layer is formed of an acid-modified polyolefin resin.

3. The battery according to claim 1 , wherein:
the leads have an elongated plate-shape or a bar-shape; and
the leads are formed of a metal.

4. The battery according to claim 1 , wherein:
the laminated sheet comprises a base layer, an aluminum layer and a heat-sealable layer; and
the heat-sealable layer is formed of a polyolefin resin.

5. A lead-insulating film for bonding a lead to a battery package, the lead extending from a battery module and projecting through and outwardly from a heat-sealed peripheral part of the battery package, the battery package being formed from a laminated sheet, the lead-insulating film comprising:
a heat-resistant base film;
a first resin layer formed on a first surface of the heat-resistant base film through a first anchor coating; and
a second resin layer formed on a second surface of the heat-resistant base film opposite from the first surface through a second anchor coating;
wherein:
each of the first and second resin layers is formed on the heat-resistant base film by an extrusion lamination process; and
the heat-resistant base film is formed of a polyethylene naphthalate resin.

6. The lead-insulating film according to claim 5 , wherein:
the first resin layer is provided on a laminated sheet-side of the heat-resistant base film and the second resin layer is provided on a lead-side of the heat-resistant base film; and
the first resin layer is formed of a polyolefin resin and the second resin layer is formed of an acid-modified polyolefin resin.

7. The lead-insulating film according to claim 5 , wherein:
the leads have an elongated plate-shape or a bar-shape; and
the leads are formed of a metal.

8. The battery according to claim 1 , wherein the first anchor coating and the second anchor coating are formed by primer coating the respective surfaces of the heat-resistant base film using an imine compound, a polyethylene imine compound, an organic titanium compound, an isocyanate compound or a silane compound.

9. The lead-insulating film according to claim 5 , wherein the first anchor coating and the second anchor coating are formed by primer coating the respective surfaces of the heat-resistant base film using an imine compound, a polyethylene imine compound, an organic titanium compound, an isocyanate compound or a silane compound.

10. The battery according to claim 8 , wherein the first anchor coating and the second anchor coating are formed by primer coating the respective surfaces of the heat-resistant base film using an imine compound, a polyethylene imine compound, or an isocyanate compound.

11. The lead-insulating film according to claim 9 , wherein the first anchor coating and the second anchor coating are formed by primer coating the respective surfaces of the heat-resistant base film using an imine compound, a polyethylene imine compound, or an isocyanate compound.

12. The battery according to claim 2 , wherein the acid-modified polyolefin resin is selected from the group consisting of unsaturated carboxylic acid graft polyolefin resins, metal-crosslinked polyethylene resins, acid-modified polyethylene resins, and acid-modified polypropylene resins.

13. The lead-insulating film according to claim 6 , wherein the acid-modified polyolefin resin is selected from the group consisting of unsaturated carboxylic acid graft polyolefin resins, metal-crosslinked polyethylene resins, acid-modified polyethylene resins, and acid-modified polypropylene resins.

14. The battery according to claim 1 , wherein the first resin layer has a thickness of 5 μm or above, the heat-resistant base film has a thickness of 3 μm or above, and the second resin layer has a thickness of 10 μm or above.

15. The lead-insulating film according to claim 5 , wherein the first resin layer has a thickness of 5 μm or above, the heat-resistant base film has a thickness of 3 μm or above, and the second resin layer has a thickness of 10 μm or above.

Assignees

• Yamashita Rikiya
• Yamada Kazuki
• Okushita Masataka
• Dainippon Printing Co Ltd

Inventors

• Yamashita Rikiya
• Yamada Kazuki
• Okushita Masataka

Classifications

• H01M50/121 Primary

  Organic material · CPC title

• Y10T428/31786

  Of polyester [e.g., alkyd, etc.] · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/105 Primary

  Pouches or flexible bags · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title